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

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

  followings||following

While we are here, add a missing colon in the boilerplate in DT binding
documents.  The "you SoC" in allwinner,sunxi-pinctrl.txt was fixed as
well.

I reworded "as the followings:" to "as follows:" for
drivers/usb/gadget/udc/renesas_usb3.c.

Link: http://lkml.kernel.org/r/1481573103-11329-32-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/drivers/atm/iphase.c b/drivers/atm/iphase.c
index 8640baf..a4fa6c8 100644
--- a/drivers/atm/iphase.c
+++ b/drivers/atm/iphase.c
@@ -21,7 +21,7 @@
       supports a variety of varients of Interphase ATM PCI (i)Chip adapter 
       card family (See www.iphase.com/products/ClassSheet.cfm?ClassID=ATM) 
       in terms of PHY type, the size of control memory and the size of 
-      packet memory. The followings are the change log and history:
+      packet memory. The following are the change log and history:
      
           Bugfix the Mona's UBR driver.
           Modify the basic memory allocation and dma logic.