Update scheduledQueryRule_API.json (#12895)

Fixed case of property overrideQueryTimeRange

Author: adklinge

specification/monitor/resource-manager/Microsoft.Insights/preview/2020-05-01-preview/scheduledQueryRule_API.json

@@ -383,7 +383,7 @@
           "format": "duration",
           "description": "The period of time (in ISO 8601 duration format) on which the Alert query will be executed (bin size)."
         },
-        "OverrideQueryTimeRange": {
+        "overrideQueryTimeRange": {
           "type": "string",
           "format": "duration",
           "description": "If specified then overrides the query time range (default is WindowSize*NumberOfEvaluationPeriods)"