Rename Mac OS X to macOS

basics.md

@@ -48,7 +48,7 @@ can use them from the very beginning to make a better use of Aseprite:
 * `Alt+click` allows you to pick colours from the active image using the Eyedropper tool ![Eyedropper Tool Icon](tools/eyedropper-tool.png):
   `Alt+Left click` samples the Foreground Color,
   `Alt+Right click` samples the Background Color.
-* The `Ctrl` key (or `⌘` on Mac OS X) can be used to select the [Move tool](move-tool.md) ![Move Tool Icon](tools/move-tool.png).
+* The `Ctrl` key (or `⌘` on macOS) can be used to select the [Move tool](move-tool.md) ![Move Tool Icon](tools/move-tool.png).
   With it you can easily select or move layers.
 * The `Tab` key hides and reveals the [timeline](timeline.md). If your timeline is ever missing, this is the fastest way to reveal it!
 * Holding `Spacebar` as you `Left click+Drag` will pan your view of the sprite you are currently editing. Useful when you're working on large graphics or are zoomed-in.

cli.md

@@ -523,7 +523,7 @@ properties](http://imgur.com/txXcgzO).
 It will log more information in the `aseprite.log` file:
 
 * On Windows: `aseprite.log` is located in `%AppData%\Aseprite\aseprite.log`
-* On Mac OS X and Linux: `aseprite.log` is located in `~/.config/aseprite/aseprite.log`
+* On macOS and Linux: `aseprite.log` is located in `~/.config/aseprite/aseprite.log`
 
 ## --help
 
@@ -608,7 +608,7 @@ Or
 
     "C:\Program Files\Aseprite\Aseprite.exe" --help
 
-On Mac OS X, if you've installed the program in `/Applications`, try the following command:
+On macOS, if you've installed the program in `/Applications`, try the following command:
 
     /Applications/Aseprite.app/Contents/MacOS/aseprite --help
 

move-tool.md

@@ -1,7 +1,7 @@
 # Move Tool
 
 You can select the Move tool ![Move tool icon](tools/move-tool.png)
-with `V` key or using `Ctrl` key (or `⌘` on Mac OS X).
+with `V` key or using `Ctrl` key (or `⌘` on macOS).
 
 This tool is useful to move the *xy*-position of a [cel](cel.md).