Fixing heading

Author: kainawroth

support/azure/azure-monitor/app-insights/telemetry/troubleshoot-app-service-issues.md

@@ -278,7 +278,7 @@ The following table provides an explanation of what these values mean, their und
 
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-## System.IO.FileNotFoundException after 2.8.44 upgrade
+### System.IO.FileNotFoundException after 2.8.44 upgrade
 
 ### [ASP.NET](#tab/net-2)