gcc/:
	* doc/c-tree.texi (Expression trees): Use @itemx for all but
	the first item for merged items.
	* doc/extend.texi (Variable Attributes): Likewise.
	* doc/install.texi (Configuration): Likewise.
	* doc/invoke.texi (RS/6000 and PowerPC Options, RX Options):
	Likewise.

From-SVN: r155263