fix commentary in fast-lock

[Frederik Fouvry]

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In GNU Emacs 21.3.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2004-02-19 on cc.at.coli.uni-sb.de
configured using `configure  --prefix=/export/black --with-xpm --with-jpeg 
--with-tiff --with-gif --with-png --with-x --with-gcc --with-pop --with-sound'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: de_DE@euro
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_GB
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

The Commentary section in fast-lock.el begins as follows:

----------------------------------------------------------------------
;;; Commentary:

;; Lazy Lock mode is a Font Lock support mode.
----------------------------------------------------------------------

The copy-paste-devil has been at work: replace "Lazy" by "Fast".