EventHub : corrected typo (Azure#5360)

* corrected typo in uri

* removed unused parameters

Author: Ajit Navasare

specification/eventhub/resource-manager/Microsoft.EventHub/stable/2017-04-01/EventHub.json

@@ -1857,7 +1857,7 @@
         }
       }
     },    
-    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.EventHub/namespaces/{namespaceName}/networkRuleSets/default": {
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.EventHub/namespaces/{namespaceName}/networkRuleSet/default": {
       "put": {
         "tags": [
           "Namespaces"
@@ -2893,25 +2893,6 @@
       "minimum": 1,
       "maximum": 1000,
       "x-ms-parameter-location": "method"
-    },
-    "ipFilterRuleNameParameter": {
-      "name": "ipFilterRuleName",
-      "in": "path",
-      "required": true,
-      "type": "string",
-      "minLength": 1,
-      "x-ms-parameter-location": "method",
-      "description": "The IP Filter Rule name."
-    },
-    "virtualNetworkRuleNameParameter": {
-      "name": "virtualNetworkRuleName",
-      "in": "path",
-      "required": true,
-      "type": "string",
-      "minLength": 1,
-      "x-ms-parameter-location": "method",
-      "description": "The Virtual Network Rule name."
-    }
-      
+    }     
   }
 }