Modernize usage of 'macOS' in doc and comments

Apple changed the spelling of its operating system again, to "macOS",
effective with macOS 10.12 Sierra (2016-09-20).  Change Emacs
documentation and comments to match this.  Stick with older OS
spellings ("OS X", "Mac OS X") when talking about older releases where
the older names are more correct.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/nsfont.m b/src/nsfont.m
index 92e7d1154bf..4f95ee3a1a8 100644
--- a/src/nsfont.m
+++ b/src/nsfont.m
@@ -1,4 +1,4 @@
-/* Font back-end driver for the NeXT/Open/GNUstep and MacOSX window system.
+/* Font back-end driver for the NeXT/Open/GNUstep and macOS window system.
    See font.h
    Copyright (C) 2006-2016 Free Software Foundation, Inc.
 
@@ -500,7 +500,7 @@ static NSSet
                   {
                     NSCharacterSet *fset = [[fontMgr fontWithFamily: family
                         traits: 0 weight: 5 size: 12.0] coveredCharacterSet];
-                    /* Some fonts on OS X, maybe many on GNUstep, return nil. */
+                    /* Some fonts on macOS, maybe many on GNUstep, return nil. */
                     if (fset == nil)
                       fset = [NSCharacterSet characterSetWithRange:
                                                NSMakeRange (0, 127)];