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

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

  explictely||explicitly

Link: http://lkml.kernel.org/r/1481573103-11329-25-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 deaa2a9..78e08a7 100644
--- a/scripts/spelling.txt
+++ b/scripts/spelling.txt
@@ -428,6 +428,7 @@
 explicite||explicit
 explicitely||explicitly
 explict||explicit
+explictely||explicitly
 explictly||explicitly
 expresion||expression
 exprimental||experimental