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, 1 insertions, 1 deletions

diff --git a/lisp/textmodes/rst.el b/lisp/textmodes/rst.el
index 3d4854e89d6..aea8e7072ea 100644
--- a/lisp/textmodes/rst.el
+++ b/lisp/textmodes/rst.el
@@ -645,7 +645,7 @@ as well but give an additional message."
     ;;
     ;; The adjustment function that adorns or rotates a section title.
     (rst-define-key map [?\C-c ?\C-=] 'rst-adjust [?\C-c ?\C-a t])
-    (rst-define-key map [?\C-=] 'rst-adjust) ; Does not work on the Mac OSX and
+    (rst-define-key map [?\C-=] 'rst-adjust) ; Does not work on macOS and
                                              ; on consoles.
 
     ;; \C-c \C-a is the keymap for adornments.