fix HookInfo and HookInfoPatch (#14585)

Author: bowgong

specification/cognitiveservices/data-plane/MetricsAdvisor/preview/v1.0/MetricsAdvisor.json

@@ -1,8 +1,8 @@
 {
   "swagger": "2.0",
   "info": {
-    "title": "Azure Cognitive Service Metrics Advisor REST API (OpenAPI v2)",
-    "description": "Azure Cognitive Service Metrics Advisor REST API (OpenAPI v2)",
+    "title": "Microsoft Azure Metrics Advisor REST API (OpenAPI v2)",
+    "description": "Microsoft Azure Metrics Advisor REST API (OpenAPI v2)",
     "version": "1.0"
   },
   "paths": {
@@ -6288,8 +6288,7 @@
           "type": "array",
           "items": {
             "type": "string"
-          },
-          "readOnly": true
+          }
         }
       },
       "discriminator": "hookType"
@@ -6438,8 +6437,7 @@
           "type": "array",
           "items": {
             "type": "string"
-          },
-          "readOnly": true
+          }
         }
       },
       "discriminator": "hookType"