[PATCH] cpufreq: governors documentation fixes

I corrected a small error and enhanced the govenor.txt file with the
ondemand daemon because the kernel configs link to the documentation but
ondemand wasn't documentated.  Feel free to include the patch in the
attachment.

Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>