Update metric alert rules quota limit

Limit increased to 2K

Author: harelbr

includes/azure-monitor-limits-alerts.md

@@ -13,7 +13,7 @@ ms.custom: "include file"
 | Resource | Default limit | Maximum limit |
 | --- | --- | --- |
 | Metric alerts (classic) |100 active alert rules per subscription. | Call support. |
-| Metric alerts |1000 active alert rules per subscription in Azure public, Azure China 21Vianet and Azure Government clouds. | Call support. |
+| Metric alerts |2,000 active alert rules per subscription in Azure public, Azure China 21Vianet and Azure Government clouds. | Call support. |
 | Activity log alerts | 100 active alert rules per subscription. | Same as default. |
 | Log alerts | 512 | Call support. |
 | Action groups |2,000 action groups per subscription. | Call support. |