Update Node Usage section in README (#4950)
Update Node Usage section in README (#4950)

Update the examples in the "Node Usage" section of the README to clarify
where you need to specify the brand you're interested in. The approach
follows the style of the "CDN Usage" section of the README.
simple-icons/simple-icons,simple-icons/simple-icons,danleech/simple-icons,danleech/simpleicons.org,danleech/simpleicons.org