Documentation for library instrumentations

[trask]

Documentation is missing for several library instrumentations (https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/docs/standalone-library-instrumentation.md).

This is full list of library instrumentations, check marks mean documentation is present.

It would be great for all of the library instrumentations to follow a layout similar to OkHttp.

• [ ] Apache Dubbo
• [x] Apache Kafka
• [ ] Armeria
• [x] AWS Lambda
• [ ] AWS SDK 1.11
• [x] AWS SDK 2.2+
• [ ] gRPC
• [ ] Guava
• [x] GraphQL Java
• [x] HikariCP
• [x] JDBC
• [x] Ktor 1.0
• [x] Ktor 2.0
• [ ] Lettuce
• [ ] Log4j appender TODO document additional configuration properties (see related javaagent doc being added in #7397)
• [x] Log4j thread context
• [ ] Logback TODO document additional configuration properties (see related javaagent doc)
• [ ] MongoDB Driver
• [x] OkHttp
• [x] Oracle UCP
• [ ] OSHI
• [ ] Reactor
• [ ] RocketMQ
• [ ] Runtime metrics
• [ ] RxJava 1.0
• [ ] RxJava 2.0
• [ ] RxJava 3.0
• [x] Spring RestTemplate
• [x] Spring Web MVC
• [x] Spring WebFlux Client
• [x] Vibur DBCP

[gabrielgiussi]

Could the docs include which are the metrics reported by the instrumentation?