extend.texi (Function Attributes [naked]): Copy-edit.

2015-02-07  Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* doc/extend.texi (Function Attributes [naked]): Copy-edit.
	(Using Assembly Language with C): Expand introduction.
	(Basic Asm): Copy-edit.  Add more information about uses of
	basic asm.
	(Extended Asm): Copy-edit.  Document new escape syntax and
	%l[label] syntax.
	(Global Reg Vars): Copy-edit.
	(Local Reg Vars): Likewise.

From-SVN: r220506