gcc:
	* doc/extend.texi, doc/gcc.texi, doc/invoke.texi, doc/md.texi,
	doc/rtl.texi, doc/tm.texi: Improve formatting.  Improve
	documentation of -std and -Wwrite-strings.

contrib:
	* texi2pod.pl: Handle @r inside @item.

From-SVN: r43718