staging: r8188eu: correct typo in comments

Correct misspellings in the comments. Issue found with checkpatch.

Signed-off-by: Jaehee Park <jhpark1013@gmail.com>
Link: https://lore.kernel.org/r/56b25e4394396823d52f1fe1b312c5a307aea0fc.1650568579.git.jhpark1013@gmail.com


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