Missing 204 response and minor typos (#12374)

Author: elabicha

specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2019-11-01/costmanagement.json

@@ -105,6 +105,9 @@
               "$ref": "#/definitions/ViewListResult"
             }
           },
+          "204": {
+            "description": "An empty response is sent when there is no information available within the selected scope."
+          },
           "default": {
             "description": "Error response describing why the operation failed.",
             "schema": {
@@ -1477,11 +1480,11 @@
           },
           "minItems": 2
         },
-        "dimension": {
+        "dimensions": {
           "description": "Has comparison expression for a dimension",
           "$ref": "#/definitions/ReportConfigComparisonExpression"
         },
-        "tag": {
+        "tags": {
           "description": "Has comparison expression for a tag",
           "$ref": "#/definitions/ReportConfigComparisonExpression"
         }

specification/cost-management/resource-manager/Microsoft.CostManagement/stable/2019-11-01/examples/ViewListByResourceGroup.json

@@ -129,6 +129,7 @@
           }
         ]
       }
-    }
+    },
+    "204": {}
   }
 }