Staging: comedi: trivial fix of a very frequent spelling mistake

something-bility is spelled as something-blity so a grep for 'blit'
would find these lines

this is so trivial that I didn't split it by subsystem / copy additional
maintainers - all changes are to comments The only purpose is to get
fewer false positives when grepping around the kernel sources.

Signed-off-by: Dirk Hohndel <hohndel@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>