Fix a typo: s/preceging/preceding/

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43200 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

misc/ruby-mode.el

@@ -448,7 +448,7 @@ Emacs to Ruby."
        ((progn
           (forward-char -1)
           (and (looking-at "\\?")
-               (or (eq (char-syntax (preceging-char)) ?w)
+               (or (eq (char-syntax (preceding-char)) ?w)
                    (ruby-special-char-p))))
         nil)
        ((and (eq option 'heredoc) (< space 0))