[ReleasePR webpubsub] [Azure SignalR Service]changes introduced by new version of Swashbuckle (#2101)

Create to sync Azure/azure-rest-api-specs#16906
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...AzureSDKAutomation:sdkAuto/webpubsub?expand=1)

Author: msftbot[bot]

schemas/2021-10-01/Microsoft.SignalRService.WebPubSub.json

@@ -231,7 +231,7 @@
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
           ],
-          "description": "Upstream auth settings."
+          "description": "Upstream auth settings. If not set, no auth is used for upstream messages."
         },
         "systemEvents": {
           "oneOf": [
@@ -316,8 +316,7 @@
             {
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
-          ],
-          "description": "Represent the identity type: systemAssigned, userAssigned, None."
+          ]
         },
         "userAssignedIdentities": {
           "oneOf": [
@@ -509,8 +508,7 @@
             {
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
-          ],
-          "description": "Indicates whether the connection has been Approved/Rejected/Removed by the owner of the service."
+          ]
         }
       },
       "description": "Connection state of the private endpoint connection"
@@ -581,8 +579,7 @@
             {
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
-          ],
-          "description": "Optional tier of this particular SKU. 'Standard' or 'Free'. \r\n\r\n`Basic` is deprecated, use `Standard` instead."
+          ]
         }
       },
       "required": [
@@ -638,11 +635,10 @@
             {
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
-          ],
-          "description": "Gets or sets the type of auth. None or ManagedIdentity is supported now."
+          ]
         }
       },
-      "description": "Upstream auth settings."
+      "description": "Upstream auth settings. If not set, no auth is used for upstream messages."
     },
     "UserAssignedIdentityProperty": {
       "type": "object",
@@ -689,8 +685,7 @@
             {
               "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
             }
-          ],
-          "description": "Default action when no other rule matches."
+          ]
         },
         "privateEndpoints": {
           "oneOf": [