curl examples all require ibm-service-instance-id header

[troyibm]

On this doc https://cloud.ibm.com/docs/services/cloud-object-storage/api-reference?topic=cloud-object-storage-curl there are many examples of curl commands and most do not show the use of the ibm-service-instance-id header. This example specifically needs it https://cloud.ibm.com/docs/services/cloud-object-storage/api-reference?topic=cloud-object-storage-curl#curl-list-objects but I think all do. Spent a loong time trying to figure out what I was doing wrong where the list of buckets was working but the list of files in the bucket wasn't. :(

[nglange]

It is only necessary for operations where the Service Instance being accessed is ambiguous: listing buckets or creating buckets. That is very strange that it caused issues when listing objects - I've verified that it is not required.