[SH] Add target options documentation

[Oleg Endo]

Hello,

The attached patch adds some SH target options that have been missing in
the documentation.

Tested with 'make info dvi pdf'.
OK to commit?

Cheers,
Oleg

2012-02-28  Oleg Endo  <olegendo@gcc.gnu.org>

	* doc/invoke.texi (-msoft-atomic): Add more detailed
	description.
	(-mbranch-cost, -mcbranchdi -mcmpeqdi -mfused-madd
	-mpretend-cmove): New.

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