staging: rtl8723bs: Fix spelling errors

Fix spelling errors.

Co-developed-by: Annika Knepper <av91obul@stud.informatik.uni-erlangen.de>
Signed-off-by: Annika Knepper <av91obul@stud.informatik.uni-erlangen.de>
Signed-off-by: Andreas Hellmich <dy26hofu@stud.informatik.uni-erlangen.de>
Link: https://lore.kernel.org/r/20191129093939.2782-1-dy26hofu@stud.informatik.uni-erlangen.de


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