Correct documentation build warnings and errors with Texinfo 4.13

* doc/emacs/custom.texi (Init Rebinding): Avoid @U command.

* doc/emacs/dired.texi (Image-Dired): EXIF, PNG and JPEG are
acronyms.

(cherry picked from commit 8a55f4d0b06c96c95a2a2a7eb4a9a7fedb105e70)

diff --git a/doc/emacs/dired.texi b/doc/emacs/dired.texi
index 720d27ab3bb92bb5347c0ef618c17177262389ad..c251a6dc2be450500e3b485cdeca03eb8fd7215a 100644 (file)
--- a/doc/emacs/dired.texi
+++ b/doc/emacs/dired.texi
@@ -1689,7 +1689,7 @@ thumbnails, controlled by the value of the option
 @vindex image-dired-dir
 @vindex image-dired-thumb-naming
 @item image-dired
-This method stores thumbnails as @sc{JPEG} images in a single directory
+This method stores thumbnails as JPEG images in a single directory
 specified by the variable @code{image-dired-dir}.  This is the default.
 The names of the thumbnail files are in this case constructed according
 to the value of @code{image-dired-thumb-naming}.
@@ -1699,13 +1699,14 @@ to the value of @code{image-dired-thumb-naming}.
 @itemx standard-xx-large
 These methods, mandated by the
 @url{https://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html,
-Thumbnail Managing Standard}, store thumbnails as @sc{PNG} images under
-the @file{thumbnails} subdirectory of the directory specified by the
-environment variable @env{XDG_CACHE_HOME} (which defaults to
+Thumbnail Managing Standard}, store thumbnails as @acronym{PNG} images
+under the @file{thumbnails} subdirectory of the directory specified by
+the environment variable @env{XDG_CACHE_HOME} (which defaults to
 @file{~/.cache}).
 @item per-directory
 This method stores the thumbnails of each directory in a
-@file{.image-dired} subdirectory of that directory, as @sc{JPEG} images.
+@file{.image-dired} subdirectory of that directory, as @acronym{jpeg}
+images.
 @end table
 
 @vindex image-dired-thumb-size
@@ -1777,10 +1778,10 @@ a comment from Dired (@code{image-dired-dired-comment-files}).
 
 @findex image-dired-thumbnail-set-image-description
   If you have the @command{exiftool} program installed, you can set the
-@sc{EXIF} @samp{ImageDescription} tag of an image file by invoking the
-@code{image-dired-thumbnail-set-image-description} command with point at
-the thumbnail of the image file.  This command prompts for the
-description of the image, and adds the @sc{EXIF} tag to it.
+@acronym{EXIF} @samp{ImageDescription} tag of an image file by invoking
+the @code{image-dired-thumbnail-set-image-description} command with
+point at the thumbnail of the image file.  This command prompts for the
+description of the image, and adds the @acronym{EXIF} tag to it.
 
 @vindex image-dired-thumb-visible-marks
   Files that are marked in Dired will also be marked in Image-Dired if