Explain *cough*-dows

(Imports upstream's 1bf80d93024e72628d4351c7ad19c0dfe635aa95.)

Change-Id: If1d61336edc7f63cdfd8ac14157376bde2651a31
Reviewed-on: https://boringssl-review.googlesource.com/13769
Commit-Queue: Adam Langley <agl@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
diff --git a/crypto/bn/asm/x86_64-mont.pl b/crypto/bn/asm/x86_64-mont.pl
index fde8fc4..9d6c013 100755
--- a/crypto/bn/asm/x86_64-mont.pl
+++ b/crypto/bn/asm/x86_64-mont.pl
@@ -117,7 +117,7 @@
 
 	mov	%r11,8(%rsp,$num,8)	# tp[num+1]=%rsp
 .Lmul_body:
-	# Some OSes, *cough*-dows, insist on stack being "wired" to
+	# Some OSes (Windows) insist on stack being "wired" to
 	# physical memory in strictly sequential manner, i.e. if stack
 	# allocation spans two pages, then reference to farmost one can
 	# be punishable by SEGV. But page walking can do good even on