bug#51584: 28.0.50; Document ibuffer-auto-mode in ibuffer-mode

[Thibault Polge]

The included patch does what the Subject line says :)

`ibuffer-auto-mode` is actually not too easy to discover, this brings it
closer to its potential users

Regards,
Thibault

>From 47cf04c3dadea46e44671a83a1536ed56bc98aaa Mon Sep 17 00:00:00 2001
From: Thibault Polge <thibault@thb.lt>
Date: Wed, 3 Nov 2021 13:24:28 +0100
Subject: [PATCH] Document ibuffer-auto-mode in ibuffer-mode

---
 lisp/ibuffer.el | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lisp/ibuffer.el b/lisp/ibuffer.el
index 6c0180590b..5526dfbe40 100644
--- a/lisp/ibuffer.el
+++ b/lisp/ibuffer.el
@@ -2483,6 +2483,7 @@ Other commands:
   `\\[ibuffer-update]' - Regenerate the list of all buffers.
           Prefix arg means to toggle whether buffers that match
           `ibuffer-maybe-show-predicates' should be displayed.
+  `\\[ibuffer-auto-mode]' - Toggle automatic update.
 
   `\\[ibuffer-switch-format]' - Change the current display format.
   `\\[forward-line]' - Move point to the next line.
-- 
2.33.0