AVS PublicCloud availability is immutable (Azure#18453)

* availability is immutable

* Update readme.md

Co-authored-by: Yuchao Yan <yuchaoyan@microsoft.com>

Author: 2 people

specification/vmware/resource-manager/Microsoft.AVS/stable/2021-12-01/vmware.json

@@ -5736,7 +5736,11 @@
         },
         "availability": {
           "description": "Properties describing how the cloud is distributed across availability zones",
-          "$ref": "#/definitions/AvailabilityProperties"
+          "$ref": "#/definitions/AvailabilityProperties",
+          "x-ms-mutability": [
+            "create",
+            "read"
+          ]
         },
         "encryption": {
           "description": "Customer managed key encryption, can be enabled or disabled",

specification/vmware/resource-manager/readme.md

@@ -222,7 +222,6 @@ This is not used by Autorest itself.
 swagger-to-sdk:
   - repo: azure-powershell
   - repo: azure-sdk-for-js
-  - repo: azure-sdk-for-python
   - repo: azure-sdk-for-python-track2
   - repo: azure-sdk-for-net
   - repo: azure-sdk-for-go