staging: rtl8192u: Fix spelling mistake athros -> Atheros and fix grammer

There is a spellig mistake, correct it and fix capital letter on the
proper noun. Also fix the grammar.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20221004150944.148157-1-colin.i.king@gmail.com


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