Doc fix for @headitem

[Eli Zaretskii]

The manual fails to tell that @headitem produces a separator line
after the heading row.  Here's the fix:

2006-09-01  Eli Zaretskii  <address@hidden>

        * doc/texinfo.txi (Multitable Rows): Document the Info output of
        @headitem.


--- doc/texinfo.txi     2006-09-01 20:57:28.872375000 +0300
+++ doc/texinfo.new     2006-09-01 21:00:12.278625000 +0300
@@ -9058,7 +9058,9 @@
 @cindex <thead> HTML tag
 You can also use @code{@@headitem} instead of @code{@@item} to produce
 a @dfn{heading row}.  The @TeX{} output for such a row is in bold, and
-the HTML, XML, and Docbook output uses the @code{<thead>} tag.
+the HTML, XML, and Docbook output uses the @code{<thead>} tag.  In
+Info, the heading row is followed by a separator line made of dashes
address@hidden
 
 Here is a complete example of a multi-column table (the text is from
 @cite{The GNU Emacs Manual}, @pxref{Split Window,, Splitting Windows,