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

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

  aligment||alignment

I did not touch the "N_BYTE_ALIGMENT" macro in
drivers/net/wireless/realtek/rtlwifi/wifi.h to avoid unpredictable
impact.

I fixed "_aligment_handler" in arch/openrisc/kernel/entry.S because
it is surrounded by #if 0 ... #endif.  It is surely safe and I
confirmed "_alignment_handler" is correct.

I also fixed the "controler" I found in the same hunk in
arch/openrisc/kernel/head.S.

Link: http://lkml.kernel.org/r/1481573103-11329-8-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>

arch/openrisc/kernel/head.S

@@ -325,7 +325,7 @@ _dispatch_do_ipage_fault:
     .org 0x500
 	EXCEPTION_HANDLE(_timer_handler)
 
-/* ---[ 0x600: Aligment exception ]-------------------------------------- */
+/* ---[ 0x600: Alignment exception ]-------------------------------------- */
     .org 0x600
 	EXCEPTION_HANDLE(_alignment_handler)
 
@@ -640,8 +640,8 @@ _flush_tlb:
 
 /* ========================================[ cache ]=== */
 
-	/* aligment here so we don't change memory offsets with
-	 * memory controler defined
+	/* alignment here so we don't change memory offsets with
+	 * memory controller defined
 	 */
 	.align 0x2000