Documentation and linting updates

client/src/sprites/README.md

@@ -5,9 +5,9 @@ but there's no way to add new sprites to the system.
 *Original Instructions (no longer valid)*
 
 We use sprites to handle various icons and images throughout the CMS. These are automatically generated
-by running `npm run build` and can be found at `/admin/client/src/sprites/dist`. To add new
+by running `yarn run build` and can be found at `/admin/client/src/sprites/dist`. To add new
 images to the sprites, simply add the image to the folder matching the image's size in
-`/admin/client/sprites` then run `npm run sprites` to generate the sprite containing your image.
+`/admin/client/sprites` then run `yarn run build` to generate the sprite containing your image.
 Along with the new sprite containing your image, there will also be a new variable in
 `/admin/client/styles/legacy/_sprites.scss` which you can use in your .scss file by first extending the class matching
 the sprite (eg `@extend .icon-sprites-32x32;`), and then including your image using the variable