[8.8] [RAM][Maintenance Window] Fix UI text (#157821) (#158003)

# Backport

This will backport the following commits from `main` to `8.8`:
- [[RAM][Maintenance Window] Fix UI text
(#157821)](#157821)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Window] Fix UI text
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Window] Fix UI text
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Window] Fix UI text
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BACKPORT-->

Co-authored-by: Lisa Cawley <[email protected]>

x-pack/plugins/alerting/public/pages/maintenance_windows/translations.ts

@@ -80,7 +80,7 @@ export const CREATE_MAINTENANCE_WINDOW_DESCRIPTION = i18n.translate(
   'xpack.alerting.maintenanceWindows.create.description',
   {
     defaultMessage:
-      'Schedule a single or recurring period in which rule notifications cease and alerts are in maintenance mode.',
+      'Schedule a single or recurring period in which new alerts do not send notifications.',
   }
 );