Update azure-monitor-limits-metrics.md

Remove option to ask for increase in # of rules in a rule group

Author: yairgil

includes/azure-monitor-limits-metrics.md

@@ -106,7 +106,7 @@ Prometheus alert rules and recording rules are defined in PromQL. They're perfor
 | Limit | Value |
 |:---|:---|
 | Rule groups per Azure Monitor workspace, in an Azure subscription  | 500<br>You can request an increase. |
-| Rules per rule group | 20<br>You can request an increase. |
+| Rules per rule group | 20<br> This limit can't be increased. |
 | Rule group evaluation interval | Between 1-15 minutes.<br>Default is 1 minute. |
 | Active alerts | No limit at this time. |