Add links to PowerShell cmdlets referenced in the document (#13204)

Also remove bold from link to match other documents in repository

Author: mburleigh

src/Monitor/Monitor/help/New-AzMetricAlertRuleV2DimensionSelection.md

@@ -18,7 +18,7 @@ New-AzMetricAlertRuleV2DimensionSelection -DimensionName <String> -ValuesToInclu
 ```
 
 ## DESCRIPTION
-The **New-AzMetricAlertRuleV2DimensionSelection** cmdlet creates a local dimension selection object to help with the construction of metric alert criteria using **New-AzMetricAlertRuleV2Criteria** cmdlet.
+The **New-AzMetricAlertRuleV2DimensionSelection** cmdlet creates a local dimension selection object to help with the construction of metric alert criteria using [New-AzMetricAlertRuleV2Criteria](https://docs.microsoft.com/en-us/powershell/module/az.monitor/new-azmetricalertrulev2criteria) cmdlet.
 
 ## EXAMPLES