Customize loaded options, faces and groups matching PATTERN.
PATTERN can be a word, a list of words (separated by spaces),
or a regexp (using some regexp special characters). If it is a word,
search for matches for that word as a substring. If it is a list of words,
search for matches for any two (or more) of those words.
If TYPE is `options', include only options.
If TYPE is `faces', include only faces.
If TYPE is `groups', include only groups. (fn PATTERN &optional TYPE)