DOCS: make mentions of macOS consistent

change all mentions and variations of OSX, OS X, MacOSX, MacOS X, etc
consistent. use the official naming macOS.

DOCS/client-api-changes.rst

@@ -277,7 +277,7 @@ API changes
         - extend the "--start" option; a leading "+", which was previously
           insignificant is now significant
         - add "cache-free" and "cache-used" properties
-        - OSX: the "coreaudio" AO spdif code is split into a separate AO
+        - macOS: the "coreaudio" AO spdif code is split into a separate AO
  --- mpv 0.4.0 ---
  1.0    - the API is declared stable
 

DOCS/interface-changes.rst

@@ -261,7 +261,7 @@ Interface changes
     - names starting with "." in ~/.mpv/scripts/ (or equivalent) are now ignored
     - js modules: ~~/scripts/modules.js/ is no longer used, global paths can be
       set with custom init (see docs), dir-scripts first look at <dir>/modules/
-    - the OSX bundle now logs to "~/Library/Logs/mpv.log" by default
+    - the macOS bundle now logs to "~/Library/Logs/mpv.log" by default
     - deprecate the --cache-secs option (once removed, the cache cannot be
       limited by time anymore)
     - remove deprecated legacy hook API ("hook-add", "hook-ack"). Use either the

DOCS/mplayer-changes.rst

@@ -138,7 +138,7 @@ Miscellaneous
   the ``D`` key insert vf_bwdif if deinterlacing is not supported otherwise).
 * Improved support for .cue files.
 
-Mac OS X
+macOS
 ~~~~~~~~
 
 * Native OpenGL backend.

DOCS/tech-overview.txt

@@ -212,7 +212,7 @@ video/out/:
     cases, the windowing code is shared among VOs, like x11_common.c for X11 and
     w32_common.c for Windows. The VOs stand between frontend and windowing code.
     vo_gpu can pick a windowing system at runtime, e.g. the same binary can
-    provide both X11 and Cocoa support on OSX.
+    provide both X11 and Cocoa support on macOS.
 
     VOs can be reconfigured at runtime. A vo_reconfig() call can change the video
     resolution and format, without destroying the window.

README.md

@@ -123,7 +123,7 @@ Libass dependencies (when building libass):
 - gcc or clang, yasm on x86 and x86_64
 - fribidi, freetype, fontconfig development headers (for libass)
 - harfbuzz (required for correct rendering of combining characters, particularly
-  for correct rendering of non-English text on OSX, and Arabic/Indic scripts on
+  for correct rendering of non-English text on macOS, and Arabic/Indic scripts on
   any platform)
 
 FFmpeg dependencies (when building FFmpeg):