bug#38818: Dired: mention deleting buffers, not just windows

[Richard Stallman]

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[[[ whether defending the US Constitution against all enemies,     ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]

How about this addition?

diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index 7354eb1..b52871e 100644
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -135,13 +135,26 @@ non-@code{nil} value, it returns that value; otherwise it 
returns
 @node Setting Hooks
 @subsection Setting Hooks
 
-  Here's an example that uses a mode hook to turn on Auto Fill mode when
-in Lisp Interaction mode:
+  Here's an example that adds a funtion to a mode hook to turn
+on Auto Fill mode when in Lisp Interaction mode:
 
 @example
 (add-hook 'lisp-interaction-mode-hook 'auto-fill-mode)
 @end example
 
+  The value of a hook variable should be a list of functions.  You can
+manipulate that list using the normal Lisp facilities, but the modular
+way is to use the functions @code{add-hook} and @code{remove-hook},
+defined below.  They take care to handle some unusual situations and
+avoid problems.
+
+  It works to put a @code{lambda}-expression function on a hook, but
+we recommend avoiding this because it can lead to confusion.  If you
+add the same @code{lambda}-expression a second time but write it
+slightly differently, you will get two equivalent but distinct
+functions on the hook.  If you then remove one of them, the other will
+still be on it.
+
 @defun add-hook hook function &optional depth local
 This function is the handy way to add function @var{function} to hook
 variable @var{hook}.  You can use it for abnormal hooks as well as for

-- 
Dr Richard Stallman
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)