Rename OS X files

README.md

@@ -95,6 +95,6 @@ repeat these steps to upgrade to future releases.
 ## Building
 
 * [Linux](docs/build-instructions/linux.md)
-* [macOS](docs/build-instructions/os-x.md)
+* [macOS](docs/build-instructions/mac-os.md)
 * [FreeBSD](docs/build-instructions/freebsd.md)
 * [Windows](docs/build-instructions/windows.md)

docs/README.md

@@ -10,7 +10,7 @@ In this directory you can only find very specific build and API level documentat
 
 Instructions for building Atom on various platforms from source.
 
-* [macOS](build-instructions/os-x.md)
+* [macOS](build-instructions/mac-os.md)
 * [Windows](build-instructions/windows.md)
 * [Linux](build-instructions/linux.md)
 * [FreeBSD](build-instructions/freebsd.md)