fix: Link to RFC for v2 addon format isntead of specific blueprint

Author: MichalBryxi

tests/dummy/app/templates/docs/standalone-apps.md

@@ -35,7 +35,7 @@ let app = new EmberApp(defaults, {
 });
 ```
 
-If the addon is authored in [v2 Addon Format](https://github.com/embroider-build/addon-blueprint) `ember-cli-addon-docs` will look for the addon source code in `src` folder.
+If the addon is authored in [v2 Addon Format](https://rfcs.emberjs.com/id/0507-embroider-v2-package-format/) `ember-cli-addon-docs` will look for the addon source code in `src` folder.
 You may need to set `addonSrcFolder` config option if addon uses another folder:
 
 ```js