Update DataLakeStorage.json

test changes for etag field for file system list paths

Author: tanyasethi-msft

Diff for: specification/storage/data-plane/Azure.Storage.Files.DataLake/preview/2023-05-03/DataLakeStorage.json

@@ -422,7 +422,7 @@
                 "type": "string",
                 "format": "date-time-rfc1123"
               },
-              "ETag": {
+              "etag": {
                 "description": "An HTTP entity tag associated with the filesystem.  Changes to filesystem properties affect the entity tag, but operations on files and directories do not.",
                 "type": "string"
               },