Adding None as allowed values for TLS (Azure#22949)

Author: jha1bhavna

specification/sql/resource-manager/Microsoft.Sql/preview/2022-08-01-preview/Servers.json

@@ -1028,7 +1028,7 @@
           "readOnly": true
         },
         "minimalTlsVersion": {
-          "description": "Minimal TLS version. Allowed values: '1.0', '1.1', '1.2'",
+          "description": "Minimal TLS version. Allowed values: 'None', '1.0', '1.1', '1.2'",
           "type": "string"
         },
         "publicNetworkAccess": {