[Storage] Swagger fix for x-ms-creation-time header on blob download (#22559)

* Swagger fix

* Add to 206 status

* Fix indent

* Wrong 206

* pretty print

Author: vincenttran-msft

specification/storage/data-plane/Microsoft.BlobStorage/preview/2021-12-02/blob.json

@@ -2684,6 +2684,12 @@
                 "format": "date-time-rfc1123",
                 "description": "Returns the date and time the container was last modified. Any operation that modifies the blob, including an update of the blob's metadata or properties, changes the last-modified time of the blob."
               },
+              "x-ms-creation-time": {
+                "x-ms-client-name": "CreationTime",
+                "type": "string",
+                "format": "date-time-rfc1123",
+                "description": "Returns the date and time the blob was created."
+              },
               "x-ms-meta": {
                 "type": "string",
                 "x-ms-client-name": "Metadata",
@@ -2957,6 +2963,12 @@
                 "format": "date-time-rfc1123",
                 "description": "Returns the date and time the container was last modified. Any operation that modifies the blob, including an update of the blob's metadata or properties, changes the last-modified time of the blob."
               },
+              "x-ms-creation-time": {
+                "x-ms-client-name": "CreationTime",
+                "type": "string",
+                "format": "date-time-rfc1123",
+                "description": "Returns the date and time the blob was created."
+              },
               "x-ms-meta": {
                 "type": "string",
                 "x-ms-client-name": "Metadata",