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>

drivers/net/wireless/ath/ath9k/ani.c

@@ -59,13 +59,13 @@ static const struct ani_ofdm_level_entry ofdm_level_table[] = {
 /*
  * MRC (Maximal Ratio Combining) has always been used with multi-antenna ofdm.
  * With OFDM for single stream you just add up all antenna inputs, you're
- * only interested in what you get after FFT. Signal aligment is also not
+ * only interested in what you get after FFT. Signal alignment is also not
  * required for OFDM because any phase difference adds up in the frequency
  * domain.
  *
  * MRC requires extra work for use with CCK. You need to align the antenna
  * signals from the different antenna before you can add the signals together.
- * You need aligment of signals as CCK is in time domain, so addition can cancel
+ * You need alignment of signals as CCK is in time domain, so addition can cancel
  * your signal completely if phase is 180 degrees (think of adding sine waves).
  * You also need to remove noise before the addition and this is where ANI
  * MRC CCK comes into play. One of the antenna inputs may be stronger but