help: Cross-link Do Not Disturb with other Notifications pages.

Fixes part of #24169.

help/desktop-notifications.md

@@ -130,7 +130,9 @@ Alternate instructions:
 {end_tabs}
 
 ## Related articles
+
 * [Stream notifications](/help/stream-notifications)
 * [PMs, mentions, and alerts](/help/pm-mention-alert-notifications)
 * [Email notifications](/help/email-notifications)
 * [Mobile notifications](/help/mobile-notifications)
+* [Do not disturb](/help/do-not-disturb)

help/include/sidebar_index.md

@@ -125,6 +125,7 @@
 * [Email notifications](/help/email-notifications)
 * [Desktop notifications](/help/desktop-notifications)
 * [Mobile notifications](/help/mobile-notifications)
+* [Do not disturb](/help/do-not-disturb)
 
 ## Apps
 * [Desktop installation guides](/help/desktop-app-install-guide)

help/mobile-notifications.md

@@ -36,7 +36,9 @@ notifications while you are actively using one of the Zulip apps.
 {end_tabs}
 
 ## Related articles
+
 * [Stream notifications](/help/stream-notifications)
 * [PMs, mentions, and alerts](/help/pm-mention-alert-notifications)
 * [Email notifications](/help/email-notifications)
 * [Desktop notifications](/help/desktop-notifications)
+* [Do not disturb](/help/do-not-disturb)

help/pm-mention-alert-notifications.md

@@ -77,3 +77,4 @@ the alert word is included in a message. Alert words are case-insensitive.
 * [Restrict wildcard mentions](/help/restrict-wildcard-mentions)
 * [Stream notifications](/help/stream-notifications)
 * [View your mentions](/help/view-your-mentions)
+* [Do not disturb](/help/do-not-disturb)

help/stream-notifications.md

@@ -42,3 +42,4 @@ explicitly set a notification preference.
 * [Mute a stream](/help/mute-a-stream)
 * [Mute a topic](/help/mute-a-topic)
 * [PMs, mentions, and alerts](/help/pm-mention-alert-notifications)
+* [Do not disturb](/help/do-not-disturb)