help: Update "View your mentions" to document collapsed view.

- Adds icons to instructions so that users can learn how to access
  this view.

Fixes #27326.

help/include/view-mentions.md

@@ -2,14 +2,17 @@
 
 {tab|desktop-web}
 
-1. Click **Mentions** in the left sidebar.
+1. Click on <i class="zulip-icon zulip-icon-at-sign"></i> **Mentions**
+   (or <i class="zulip-icon zulip-icon-at-sign"></i> if the **views**
+   section is collapsed) in the left sidebar.
 
 1. Browse your mentions. You can click on a message recipient bar to go
    to the [conversation](/help/recent-conversations) where you were mentioned.
 
 !!! tip ""
+
     You can also [search your mentions](/help/search-for-messages) using the
-    `is:mentioned` flag.
+    `is:mentioned` filter.
 
 {tab|mobile}
 

help/view-your-mentions.md

@@ -7,14 +7,15 @@ the messages where you were mentioned from a dedicated tab.
 !!! warn ""
 
     Because [silent mentions](/help/mention-a-user-or-group#silently-mention-a-user)
-    are designed not to attract attention, they are excluded from the **Mentions** tab.
+    are designed not to attract attention, they are excluded from the
+    **Mentions** tab.
 
 ## View your mentions
 
 {!view-mentions.md!}
 
-Topics with unread @-mentions are marked with an **@** indicator next to the number
-of unread messages.
+Topics with unread @-mentions are marked with an **@** indicator next to the
+number of unread messages.
 
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