Adds metadata for the S3 Service and puts it into the Presigned URL scenario. (#6993)

Author: beqqrry-aws

.doc_gen/metadata/s3_metadata.yaml

@@ -2789,6 +2789,7 @@ s3_Scenario_PresignedUrl:
           excerpts:
             - snippet_tags:
                 - s3.php.presigned_url.complete
+                - php.example_code.s3.service.S3Service
   services:
     s3: {}
 s3_Scenario_ObjectVersioningUsage:

php/example_code/s3/README.md

@@ -60,7 +60,7 @@ Code excerpts that show you how to call individual service functions.
 Code examples that show you how to accomplish a specific task by calling multiple
 functions within the same service.
 
-- [Create a presigned URL](PresignedURL.php)
+- [Create a presigned URL](S3Service.php)
 - [Create a serverless application to manage photos](../../applications/photo_asset_manager)