[ReleasePR containerregistry] {containerregistry} Fix #21603: Mention…

… anonymous pull access is a pr… (#2670)

Create to sync Azure/azure-rest-api-specs#21623
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/containerregistry?expand=1)

schemas/2022-02-01-preview/Microsoft.ContainerRegistry.json

@@ -1979,7 +1979,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "Enables registry-wide pull from unauthenticated clients."
+          "description": "Enables registry-wide pull from unauthenticated clients. It's in preview and available in the Standard and Premium service tiers."
         },
         "dataEndpointEnabled": {
           "oneOf": [