addressing PR feedback: improve changelog message, shorten some names

Author: ianbotsf

.changes/ab40d3c7-4701-47ee-87f5-985d68db8b7f.json

@@ -1,7 +1,7 @@
 {
     "id": "ab40d3c7-4701-47ee-87f5-985d68db8b7f",
     "type": "bugfix",
-    "description": "Include more information when retry strategy halts early due to capacity errors",
+    "description": "Include more information when retry strategy halts early due to token bucket capacity errors",
     "issues": [
         "awslabs/aws-sdk-kotlin#1321"
     ]

services/s3/common/src/aws/sdk/kotlin/services/s3/internal/S3ErrorMetadata.kt

@@ -47,7 +47,7 @@ internal fun setS3ErrorMetadata(exception: Any, response: HttpResponse, errorDet
                 attributes.setIfValueNotNull(S3ErrorMetadata.RequestId2, requestId2)
 
                 attributes.appendValue(
-                    ErrorMetadata.AdditionalClientContext,
+                    ErrorMetadata.ClientContext,
                     ClientErrorContext("Extended request ID", requestId2),
                 )
             }