Adding quotes to notify_by parameter (#29126)

Correcting syntax of the notify_by parameter

Co-authored-by: Esther Kim <[email protected]>

Author: DavidGrashton

content/en/monitors/guide/alert_aggregation.md

@@ -76,7 +76,7 @@ If you are managing your monitors with the API, use the variable `notify_by` to
 
 | Type of Alert     | Configuration Example                  |
 |-------------------|----------------------------------------|
-| Simple Alert      | `"notify_by": [*]`                     |
+| Simple Alert      | `"notify_by": ["*"]`                     |
 | Multi Alert       | `"notify_by": [<group>]`, for example, `"notify_by": ["topic"]` |
 
 For more information, see the [API documentation][4].
@@ -88,4 +88,4 @@ For more information, see the [API documentation][4].
 [1]: /monitors/configuration/?tab=thresholdalert#simple-alert
 [2]: /monitors/notify/variables/?tab=is_alert#triggered-variables
 [3]: /monitors/configuration/?tab=thresholdalert#multi-alert
-[4]: /api/latest/monitors/#create-a-monitor
+[4]: /api/latest/monitors/#create-a-monitor