Update Enable-AzureRmActivityLogAlert.md

There is a error in:
Example 1: Disable an activity log alert

Should be:
Example 1: Enable an activity log alert

Author: SwayTex

src/ResourceManager/Insights/Commands.Insights/help/Enable-AzureRmActivityLogAlert.md

@@ -37,7 +37,7 @@ This cmdlet implements the ShouldProcess pattern, i.e. it might request confirma
 
 ## EXAMPLES
 
-### Example 1: Disable an activity log alert
+### Example 1: Enable an activity log alert
 ```
 PS C:\>Enable-AzureRmActivityLogAlert -Name "alert1" -ResourceGroupName "Default-ActivityLogsAlerts"
 ```