[PATCH] Mention Documenation/ABI/ requirements in Documentation/SubmitChecklist

Mention Documenation/ABI/ requirements in Documentation/SubmitChecklist.
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Documentation/SubmitChecklist

@@ -61,3 +61,6 @@ kernel patches.
     Documentation/kernel-parameters.txt.
 
 18: All new module parameters are documented with MODULE_PARM_DESC()
+
+19: All new userspace interfaces are documented in Documentation/ABI/.
+    See Documentation/ABI/README for more information.