Update the documentation links

Updates the example and dependency links in the documentation, to use URLs that
are valid within the monorepo.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

doc/plugin/Redial.md

@@ -60,4 +60,4 @@ The `Redial` object has only one property, the key to trigger it.
 Starting from the [example][plugin:example] is the recommended way of getting
 started with the plugin.
 
- [plugin:example]: https://github.com/keyboardio/Kaleidoscope-Redial/blob/master/examples/Redial/Redial.ino
+ [plugin:example]: ../../examples/Redial/Redial.ino