Update README.md

This updates the link to the documentation

Author: kjarosh

README.md

@@ -2,6 +2,6 @@
 
 This is an archive of the official ActionScript 3 documentation from Adobe, before it was taken down.
 
-You may view this archive at https://docs.ruffle.rs/as3/
+You may view this archive at https://docs.ruffle.rs/
 
 All content is licensed [CC BY-NC-SA 3.0](https://creativecommons.org/licenses/by-nc-sa/3.0/).