[8.9] [DOCS] Clarify space awareness of maintenance windows (elastic#176628) (elastic#177758)

# Backport

This will backport the following commits from `main` to `8.9`:
- [[DOCS] Clarify space awareness of maintenance windows
(elastic#176628)](elastic#176628)

<!--- Backport version: 8.9.8 -->

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

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windows\n(elastic#176628)](https://github.com/elastic/kibana/pull/176628)\n\n<!---
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[Backport
tool\ndocumentation](https://github.com/sqren/backport)\n\n<!--BACKPORT
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`main` to `8.12`:\n- [[DOCS] Clarify space awareness of maintenance
windows\n(elastic#176628)](https://github.com/elastic/kibana/pull/176628)\n\n<!---
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[Backport
tool\ndocumentation](https://github.com/sqren/backport)\n\n<!--BACKPORT
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BACKPORT-->

Author: lcawl

docs/management/maintenance-windows/maintenance-windows.asciidoc

@@ -11,7 +11,7 @@ preview::[]
 You can schedule single or recurring maintenance windows to temporarily reduce rule notifications.
 For example, a maintenance window prevents false alarms during planned outages.
 
-Maintenance windows affect all rules in all {kib} apps and spaces.
+By default, a maintenance window affects all rules in all {kib} apps within its space.
 Alerts continue to be generated, however notifications are suppressed as follows:
 
 - When an alert occurs during a maintenance window, there are no notifications.