Small doc fix.

* org.texi (Fast access to TODO states): Fix documentation
about allowed characters for fast todo selection.

* org.el (org-todo-keywords): Ditto.

This fixes this wrong change here:
http://orgmode.org/w/?p=org-mode.git;a=commit;h=b6cb72

doc/org.texi

@@ -3925,9 +3925,9 @@ from @code{DONE} to @code{REPORT} in the example above.  See also
 
 If you would like to quickly change an entry to an arbitrary TODO state
 instead of cycling through the states, you can set up keys for single-letter
-access to the states.  This is done by adding the selection
-letter@footnote{Only alphabetical letters are allowed for fast TODO selection
-keys.} after each keyword, in parentheses.  For example:
+access to the states.  This is done by adding the selection character after
+each keyword, in parentheses@footnote{All characters are allowed except
+@code{@@^!}, which have a special meaning here.}.  For example:
 
 @lisp
 (setq org-todo-keywords

lisp/org.el

@@ -2105,11 +2105,11 @@ cycling, see the manual.
 TODO keywords and interpretation can also be set on a per-file basis with
 the special #+SEQ_TODO and #+TYP_TODO lines.
 
-Each keyword can optionally specify a letter for fast state selection
+Each keyword can optionally specify a character for fast state selection
 \(in combination with the variable `org-use-fast-todo-selection')
 and specifiers for state change logging, using the same syntax that
 is used in the \"#+TODO:\" lines.  For example, \"WAIT(w)\" says that
-the WAIT state can be selected with the \"w\" letter.  \"WAIT(w!)\"
+the WAIT state can be selected with the \"w\" key.  \"WAIT(w!)\"
 indicates to record a time stamp each time this state is selected.
 
 Each keyword may also specify if a timestamp or a note should be