scripts/spelling.txt: add "swith" pattern and fix typo instances

Fix typos and add the following to the scripts/spelling.txt:

  swith||switch
  swithable||switchable
  swithed||switched
  swithing||switching

While we are here, fix the "update" to "updates" in the touched hunk in
drivers/net/wireless/marvell/mwifiex/wmm.c.

Link: http://lkml.kernel.org/r/1481573103-11329-2-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/scripts/spelling.txt b/scripts/spelling.txt
index b3a1994..10df6d0 100644
--- a/scripts/spelling.txt
+++ b/scripts/spelling.txt
@@ -991,6 +991,10 @@
 suspicously||suspiciously
 swaping||swapping
 switchs||switches
+swith||switch
+swithable||switchable
+swithed||switched
+swithing||switching
 symetric||symmetric
 synax||syntax
 synchonized||synchronized