This updates all places in documentation that refer to "Mac OS X", "OS X", etc.
to instead use the modern name "macOS" when no specific version number is
If a specific version is mentioned, this attempts to use the OS name at the time
of that version:
- Mac OS X for 10.0 - 10.7
- OS X for 10.8 - 10.11
- macOS for 10.12 - present