Added OrMetadata Transform (Azure#21270)

Author: tasherif-msft

sdk/storage/azure-storage-blob/swagger/README.md

@@ -128,4 +128,17 @@ directive:
             $[property]["parameters"] = $[property]["parameters"].filter(function(param) { return (typeof param['$ref'] === "undefined") || (false == param['$ref'].endsWith("#/parameters/ContainerName"))});
         }
     }
+```
+
+### Change to OrMetadata
+``` yaml
+directive:
+- from: swagger-document
+  where: $.definitions.BlobItemInternal
+  transform: |
+    $.discriminator = "OrMetadata";
+    $.required = [ "OrMetadata" ];
+    $.properties.OrMetadata = $.properties.ObjectReplicationMetadata;
+    $.properties.OrMetadata["x-ms-client-name"] = "ObjectReplicationMetadata";
+    delete $.properties.ObjectReplicationMetadata;
 ```