chore: traces documentation

Warning: This pull request is touching the following templated files:

.github/workflows/ci.yaml
.kokoro/presubmit/graalvm-native.cfg
google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/DatabaseAdminClient.java
google-cloud-spanner/src/main/java/com/google/cloud/spanner/admin/database/v1/package-info.java
google-cloud-spanner/src/main/java/com/google/cloud/spanner/v1/stub/SpannerStubSettings.java
google-cloud-spanner/src/test/java/com/google/cloud/spanner/admin/database/v1/DatabaseAdminClientTest.java
google-cloud-spanner/src/test/java/com/google/cloud/spanner/v1/SpannerClientTest.java
grpc-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/DatabaseAdminGrpc.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/Backup.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/BackupInfo.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/BackupInfoOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/BackupOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/BackupProto.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CommonProto.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CreateBackupEncryptionConfig.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CreateBackupEncryptionConfigOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CreateBackupMetadata.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CreateBackupMetadataOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CreateBackupRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CreateBackupRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CreateDatabaseRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/CreateDatabaseRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/Database.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/DatabaseOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/DeleteBackupRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/DropDatabaseRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/EncryptionConfig.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/EncryptionConfigOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/EncryptionInfo.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/EncryptionInfoOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/GetBackupRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/GetDatabaseDdlRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/GetDatabaseDdlResponse.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/GetDatabaseRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListBackupOperationsRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListBackupOperationsRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListBackupsRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListBackupsRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListBackupsResponse.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListBackupsResponseOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabaseOperationsRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabaseOperationsRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabasesRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabasesRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabasesResponse.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabasesResponseOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabaseRolesRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabaseRolesRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/ListDatabaseRolesResponse.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/RestoreDatabaseEncryptionConfig.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/RestoreDatabaseEncryptionConfigOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/RestoreDatabaseMetadata.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/RestoreDatabaseMetadataOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/RestoreDatabaseRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/RestoreDatabaseRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/SpannerDatabaseAdminProto.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateBackupRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlRequest.java
proto-google-cloud-spanner-admin-database-v1/src/main/java/com/google/spanner/admin/database/v1/UpdateDatabaseDdlRequestOrBuilder.java
proto-google-cloud-spanner-admin-database-v1/src/main/proto/google/spanner/admin/database/v1/backup.proto
proto-google-cloud-spanner-admin-database-v1/src/main/proto/google/spanner/admin/database/v1/common.proto
proto-google-cloud-spanner-admin-database-v1/src/main/proto/google/spanner/admin/database/v1/spanner_database_admin.proto
proto-google-cloud-spanner-v1/src/main/java/com/google/spanner/v1/ReadRequest.java
proto-google-cloud-spanner-v1/src/main/java/com/google/spanner/v1/ReadRequestOrBuilder.java
proto-google-cloud-spanner-v1/src/main/java/com/google/spanner/v1/SpannerProto.java
proto-google-cloud-spanner-v1/src/main/proto/google/spanner/v1/commit_response.proto
proto-google-cloud-spanner-v1/src/main/proto/google/spanner/v1/keys.proto
proto-google-cloud-spanner-v1/src/main/proto/google/spanner/v1/mutation.proto
proto-google-cloud-spanner-v1/src/main/proto/google/spanner/v1/query_plan.proto
proto-google-cloud-spanner-v1/src/main/proto/google/spanner/v1/result_set.proto
proto-google-cloud-spanner-v1/src/main/proto/google/spanner/v1/spanner.proto
proto-google-cloud-spanner-v1/src/main/proto/google/spanner/v1/transaction.proto
proto-google-cloud-spanner-v1/src/main/proto/google/spanner/v1/type.proto
samples/pom.xml

googleapis / java-spanner

chore: traces documentation #3195