Correct a few comments in kernel-doc Doc and source files.

(akpm: note: the patch removes a non-ascii character and might have to be
applied by hand..)
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>