help: Document "Mute/Unmute stream" mobile app feature.

Fixes #22196.

help/include/mobile-stream-settings-menu-tip.md

@@ -1,6 +1,6 @@
 !!! tip ""
 
-    If you are viewing a single stream or topic, you can access the
+    If you are in a stream view, you can access the
     stream settings menu from the information
     (<img src="/static/images/help/mobile-info-circle-icon.svg" alt="information" class="mobile-icon"/>)
     button in the top right corner of the app.

help/include/stream-long-press-menu-tip.md

@@ -1,4 +1,4 @@
 !!! tip ""
 
-    If you are viewing a single stream, you can access the long-press
+    If you are in a stream view, you can access the long-press
     menu from the bar at the top of the app.

help/mute-a-stream.md

@@ -23,6 +23,14 @@ sorted to the bottom of their section.
 
 1. Click **Mute stream**.
 
+{tab|mobile}
+
+{!stream-long-press-menu.md!}
+
+1. Tap **Mute stream**.
+
+{!stream-long-press-menu-tip.md!}
+
 {end_tabs}
 
 
@@ -36,6 +44,14 @@ sorted to the bottom of their section.
 
 1. Click **Unmute stream**.
 
+{tab|mobile}
+
+{!stream-long-press-menu.md!}
+
+1. Tap **Unmute stream**.
+
+{!stream-long-press-menu-tip.md!}
+
 {end_tabs}
 
 ## Alternate method to mute or unmute a stream
@@ -52,6 +68,16 @@ sorted to the bottom of their section.
 
 1. Under **Personal settings**, toggle **Mute stream**.
 
+{tab|mobile}
+
+{!stream-long-press-menu.md!}
+
+1. Tap **Stream settings**.
+
+1. Toggle **Muted**.
+
+{!mobile-stream-settings-menu-tip.md!}
+
 {end_tabs}
 
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