staging: r8188eu: correct misspelled words in comments

Fix spelling mistakes in code comments across the driver.

Signed-off-by: Deepak R Varma <drv@mailo.com>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/00be5f2a97b0c899279bd8f9cd27634186b77b9d.1666299151.git.drv@mailo.com


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