Update "Mac OSX" references to "macOS"

Review Request #825 — Created July 22, 2021 and submitted — Latest diff uploaded

Information

pidgin/nest
default
41480f8ac1fe

Reviewers

Apple no longer calls their OS "Mac OSX" instead over the final releases of OSX they switched over to "macOS 10", followed by "macOS 11" and so on. With this change, we will start using macOS to refer to Apple's operating system.

Ran dev-server.sh and verified content looked as intended.