scripts/spelling.txt: add notifer||notifier to spelling.txt

This typo was not listed in scripts/spelling.txt, thus it was more
difficult to detect. Add it for convenience.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: WangYuli <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: Avenger-285714

scripts/spelling.txt

@@ -1099,6 +1099,7 @@ notication||notification
 notications||notifications
 notifcations||notifications
 notifed||notified
+notifer||notifier
 notity||notify
 notfify||notify
 nubmer||number