Edit description of orderBy (Azure#22807)

Author: gulopesd

specification/monitor/resource-manager/Microsoft.Insights/stable/2019-07-01/metrics_API.json

@@ -388,7 +388,7 @@
       "in": "query",
       "required": false,
       "type": "string",
-      "description": "The aggregation to use for sorting results and the direction of the sort.\nOnly one order can be specified.\nExamples: sum asc.",
+      "description": "The aggregation to use for the results and the direction to sort them by ('asc' for ascending, or 'desc' for descending).\nOnly one order can be specified.\nExamples: sum asc.",
       "x-ms-parameter-location": "method"
     },
     "ResultTypeParameter": {