; Fix doc strings in lisp/image/ directory

; Fix doc strings in lisp/image/ directory

* lisp/image/wallpaper.el (wallpaper-setter)
(wallpaper--find-command, wallpaper--x-monitor-name)
(wallpaper--format-arg):
* lisp/image/image-dired-util.el
(image-dired-associated-dired-buffer)
(image-dired--with-dired-buffer):
* lisp/image/image-dired-tags.el (image-dired--with-db-file)
(image-dired-remove-tag, image-dired-list-tags)
(image-dired-tag-files, image-dired-write-comments)
(image-dired-update-property):
* lisp/image/image-dired-external.el (image-dired-cmd-pngnq-options)
(image-dired-cmd-pngcrush-program)
(image-dired-cmd-pngcrush-options)
(image-dired-cmd-optipng-options)
(image-dired-cmd-create-standard-thumbnail-options)
(image-dired-cmd-rotate-original-program)
(image-dired-cmd-rotate-original-options)
(image-dired-cmd-write-exif-data-options, image-dired-queue)
(image-dired-queue-active-limit, image-dired-pngnq-thumb)
(image-dired-pngcrush-thumb, image-dired-optipng-thumb)
(image-dired-thumb-queue-run, image-dired-get-exif-file-name)
(image-dired-thumbnail-set-image-description):
* lisp/image/image-dired.el (image-dired-thumbnail-storage)
(image-dired-tags-db-file)
(image-dired-rotate-original-ask-before-overwrite)
(image-dired-line-up-method, image-dired-track-movement)
(image-dired-display-properties-format)
(image-dired-external-viewer)
(image-dired-show-all-from-dir-max-files)
(image-dired-insert-image)
(image-dired-dired-with-window-configuration)
(image-dired-restore-window-configuration)
(image-dired-track-original-file)
(image-dired-toggle-movement-tracking)
(image-dired-format-properties-string)
(image-dired--on-file-in-dired-buffer)
(image-dired-thumbnail-display-external)
(image-dired-display-image, image-dired-copy-filename-as-kill):
* lisp/image/image-dired-dired.el
(image-dired-dired-toggle-marked-thumbs)
(image-dired-dired-after-readin-hook)
(image-dired-next-line-and-display)
(image-dired-previous-line-and-display)
(image-dired-mark-and-display-next, image-dired-track-thumbnail)
(image-dired-dired-next-line, image-dired-dired-previous-line)
(image-dired-dired-display-external)
(image-dired-copy-with-exif-file-name)
(image-dired-mark-tagged-files)
(image-dired-dired-display-properties):
* lisp/image/image-crop.el (image-crop-exif-rotate)
(image-crop-resize-command, image-crop-cut-command)
(image-crop-crop-command, image-crop-rotate-command)
(image-crop-buffer-text-function, image-cut-color):
* lisp/image/image-converter.el (image-converter)
(image-convert-to-format, image-converter-regexp)
(image-converter--converters, image-convert-p, image-convert)
(image-converter--value, image-converter--probe)
(image-converter--find-converter, image-converter--convert)
(image-converter-add-handler):
* lisp/image/exif.el (exif-parse-buffer, exif-field)
(exif-orientation, exif--direct-ascii-value)
(exif--process-value, exif--read-chunk, exif--read-number-be)
(exif--read-number-le, exif--read-number): Fix doc strings.