extend.texi (PowerPC AltiVec Built-in Functions): Rename this subsection to "PowerPC...

extend.texi (PowerPC AltiVec Built-in Functions): Rename this subsection to "PowerPC AltiVec/VSX Built-in Functions".

gcc/ChangeLog:

2018-07-18  Kelvin Nilsen  <kelvin@gcc.gnu.org>

	* doc/extend.texi (PowerPC AltiVec Built-in Functions): Rename
	this subsection to "PowerPC AltiVec/VSX Built-in Functions".
	(PowerPC AltiVec/VSX Built-in Functions): New name for subsection
	previously known as "PowerPC AltiVec Built-in Functions".  Move
	some material to new subsubsections "PowerPC AltiVec Built-in
	Functions on ISA 2.06" and "PowerPC AltiVec Built-in Functions on
	ISA 2.07".
	(PowerPC Altivec Built-in Functions on ISA 2.05): New subsubsection.
	(PowerPC Altivec Built-in Functions on ISA 2.06): Likewise.
	(PowerPC Altivec Built-in Functions on ISA 2.07): Likewise.
	(PowerPC Altivec Built-in Functions on ISA 3.0): Likewise.

From-SVN: r262863