Fix typos in the manual.

Fix typos in the manual.

gcc/:
	* doc/extend.texi (Function Attributes, Volatiles): Fix typos.
	* doc/install.texi (Prerequisites, Specific): Likewise.
	* doc/invoke.texi (C Dialect Options, Debugging Options)
	(Optimize Options, MicroBlaze Options)
	(RS/6000 and PowerPC Options, RX Options, Code Gen Options):
	Likewise.
	* doc/objc.texi (Method signatures)
	(Fast enumeration protocol): Likewise.
	* doc/tm.texi.in (Run-time Target, Register Arguments)
	(Scheduling, Macros for Initialization, Misc): Likewise.
	* doc/tm.texi: Renerate.

From-SVN: r168202