* completion.el (add-completion-to-head, add-completion): Doc fixes.

* completion.el (add-completion-to-head, add-completion): Doc fixes.
  (completion-search-next, add-completions-from-file):
  Fix typos in docstrings.

* filesets.el (filesets-menu-ensure-use-cached)
  (filesets-ingroup-patterns, filesets-filetype-property):
* tutorial.el (get-lang-string):
* play/gamegrid.el (gamegrid-score-file-length, gamegrid-add-score):
  Fix typos in docstrings.

* image-dired.el (image-dired-dired-after-readin-hook): Doc fix.
  (image-dired-line-up-method, image-dired-thumb-size)
  (image-dired-cmd-write-exif-data-options, image-dired-write-tags)
  (image-dired-track-original-file, image-dired-track-thumbnail)
  (image-dired-dired-next-line, image-dired-dired-previous-line)
  (image-dired-write-comments): Reflow docstrings.
  (image-dired-show-all-from-dir-max-files)
  (image-dired-format-properties-string, image-dired-create-thumbs)
  (image-dired-mark-tagged-files, image-dired-gallery-generate):
  Fix typos in docstrings.

* savehist.el (savehist-save-minibuffer-history, savehist-file)
  (savehist-additional-variables, savehist-ignored-variables)
  (savehist-file-modes, savehist-autosave-interval):
* startup.el (inhibit-startup-echo-area-message, inhibit-default-init)
  (inhibit-startup-buffer-menu, mail-host-address, user-mail-address)
  (fancy-splash-image):
* thumbs.el (thumbs-thumbsdir, thumbs-geometry, thumbs-relief)
  (thumbs-conversion-program, thumbs-margin):
  Remove spurious * in docstrings.