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

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

  therfore||therefore

Besides, tidy up comment blocks for 80-col wrapping.

Link: http://lkml.kernel.org/r/1481573103-11329-31-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 3aa95a1..56a9860 100644
--- a/scripts/spelling.txt
+++ b/scripts/spelling.txt
@@ -1041,6 +1041,7 @@
 teh||the
 temorary||temporary
 temproarily||temporarily
+therfore||therefore
 thier||their
 threds||threads
 threshhold||threshold