Replace OSX with macOS

doc/00-intro.md

@@ -40,9 +40,9 @@ To install packages from sources instead of simple zip archives, you will need
 git, svn, fossil or hg depending on how the package is version-controlled.
 
 Composer is multi-platform and we strive to make it run equally well on Windows,
-Linux and OSX.
+Linux and macOS.
 
-## Installation - Linux / Unix / OSX
+## Installation - Linux / Unix / macOS
 
 ### Downloading the Composer Executable
 
@@ -100,7 +100,7 @@ Linux distributions.
 > **Note:** If the above fails due to permissions, you may need to run it again
 > with sudo.
 
-> **Note:** On some versions of OSX the `/usr` directory does not exist by
+> **Note:** On some versions of macOS the `/usr` directory does not exist by
 > default. If you receive the error "/usr/local/bin/composer: No such file or
 > directory" then you must create the directory manually before proceeding:
 > `mkdir -p /usr/local/bin`.

doc/03-cli.md

@@ -856,7 +856,7 @@ is a hidden, global (per-user on the machine) directory that is shared between
 all projects.
 
 By default it points to `C:\Users\<user>\AppData\Roaming\Composer` on Windows
-and `/Users/<user>/.composer` on OSX. On *nix systems that follow the [XDG Base
+and `/Users/<user>/.composer` on macOS. On *nix systems that follow the [XDG Base
 Directory Specifications](https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html),
 it points to `$XDG_CONFIG_HOME/composer`. On other *nix systems, it points to
 `/home/<user>/.composer`.
@@ -878,7 +878,7 @@ configuration in the project's `composer.json` always wins.
 The `COMPOSER_CACHE_DIR` var allows you to change the Composer cache directory,
 which is also configurable via the [`cache-dir`](06-config.md#cache-dir) option.
 
-By default it points to `$COMPOSER_HOME/cache` on \*nix and OSX, and
+By default it points to `$COMPOSER_HOME/cache` on \*nix and macOS, and
 `C:\Users\<user>\AppData\Local\Composer` (or `%LOCALAPPDATA%/Composer`) on Windows.
 
 ### COMPOSER_PROCESS_TIMEOUT