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>
diff --git a/arch/arc/kernel/unwind.c b/arch/arc/kernel/unwind.c
index 61fd1ce..b6e4f7a 100644
--- a/arch/arc/kernel/unwind.c
+++ b/arch/arc/kernel/unwind.c
@@ -1051,9 +1051,9 @@
 		++ptr;
 	}
 	if (cie != NULL) {
-		/* get code aligment factor */
+		/* get code alignment factor */
 		state.codeAlign = get_uleb128(&ptr, end);
-		/* get data aligment factor */
+		/* get data alignment factor */
 		state.dataAlign = get_sleb128(&ptr, end);
 		if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end)
 			cie = NULL;