Fix usage of @itemx in ELisp manual.

 doc/lispref/hooks.texi (Standard Hooks): Use @item, not @itemx, as the first
 directive in a group of items.

doc/lispref/ChangeLog

+2013-01-05  Eli Zaretskii  <eliz@gnu.org>
+
+	* hooks.texi (Standard Hooks): Use @item, not @itemx, as the first
+	directive in a group of items.
+
 2013-04-02  Chong Yidong  <cyd@gnu.org>
 
 	* keymaps.texi (Key Sequences): Remove obsolete sentence

doc/lispref/hooks.texi

@@ -121,7 +121,7 @@ The command loop runs this soon after @code{post-command-hook} (q.v.).
 @item delete-terminal-functions
 @xref{Multiple Terminals}.
 
-@itemx pop-up-frame-function
+@item pop-up-frame-function
 @itemx split-window-preferred-function
 @xref{Choosing Window Options}.