bug#27639: 25.2; Fix syntax for minor mode enabling in dir locals in manual

[Kaushal Modi <kaushal.modi@gmail.com>]

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Hello,

I have attached this patch based off emacs-25 branch that clarifies the
documentation about minor mode enabling in .dir-locals.el.
-- 

Kaushal Modi

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From dcae725b40c7200c0633d3594533028994593793 Mon Sep 17 00:00:00 2001
From: Kaushal Modi <kaushal.modi@gmail.com>
Date: Mon, 10 Jul 2017 18:31:42 -0400
Subject: [PATCH] Add documentation on enabling minor modes using
 .dir-locals.el

* doc/emacs/custom.texi (Directory Variables): Add an example that
shows how a minor mode can be enabled in a .dir-local.el (Bug#27639).
Clarify that indent-tabs-mode is not a minor mode.
---
 doc/emacs/custom.texi | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/doc/emacs/custom.texi b/doc/emacs/custom.texi
index 51992ea028..a174f40f2b 100644
--- a/doc/emacs/custom.texi
+++ b/doc/emacs/custom.texi
@@ -1323,7 +1323,8 @@ Directory Variables
 
 @example
 ((nil . ((indent-tabs-mode . t)
-         (fill-column . 80)))
+         (fill-column . 80)
+         (mode . auto-fill)))
  (c-mode . ((c-file-style . "BSD")
             (subdirs . nil)))
  ("src/imported"
@@ -1332,13 +1333,16 @@ Directory Variables
 @end example
 
 @noindent
-This sets @samp{indent-tabs-mode} and @code{fill-column} for any file
-in the directory tree, and the indentation style for any C source
-file.  The special @code{subdirs} element is not a variable, but a
-special keyword which indicates that the C mode settings are only to
-be applied in the current directory, not in any subdirectories.
-Finally, it specifies a different @file{ChangeLog} file name for any
-file in the @file{src/imported} subdirectory.
+This sets the variables @samp{indent-tabs-mode} and @code{fill-column}
+for any file in the directory tree, and the indentation style for any
+C source file.  The special @code{mode} element specifies the minor
+mode to be enabled.  So @code{(mode . auto-fill)} specifies that the
+minor mode @code{auto-fill-mode} needs to be enabled.  The special
+@code{subdirs} element is not a variable, but a special keyword which
+indicates that the C mode settings are only to be applied in the
+current directory, not in any subdirectories.  Finally, it specifies a
+different @file{ChangeLog} file name for any file in the
+@file{src/imported} subdirectory.
 
 @findex add-dir-local-variable
 @findex delete-dir-local-variable
-- 
2.13.0