message: docs: Add link to Safari page in browser list
  Adds missing Safari link to the list of common browsers.
  Also removes no-longer-needed caveat regarding OS support.
diff: @@ -3,7 +3,7 @@ that you use the most up-to-date browser that's compatible with your operating s
  supported.
  * The new [Microsoft Edge](https://www.microsoft.com/edge)
  -* Safari (latest version, Mac only)
  +* [Safari](https://www.apple.com/safari) (latest version)
  * [Mozilla Firefox](https://www.mozilla.org/firefox) (latest version)
  * [Google Chrome](https://www.google.com/chrome/browser/index.html) (latest version)
  