staging: rtl8192u: fix typos in comments

correct spelling errors across 8 lines of comments.

Signed-off-by: Iain Craig <coldcity@gmail.com>
Link: https://lore.kernel.org/r/20210428141734.GA2498@ubuntu


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>