Update referenced link

docs/running-multiple-instances.md

@@ -1,4 +1,4 @@
-By default, Watchtower will clean up other instances and won't allow multiple instances running on the same Docker host or swarm. It is possible to override this behavior by defining a [scope](https://containrrr.github.io/watchtower/arguments/#filter_by_scope) to each running instance.
+By default, Watchtower will clean up other instances and won't allow multiple instances running on the same Docker host or swarm. It is possible to override this behavior by defining a [scope](https://nicholas-fedor.github.io/watchtower/arguments/#filter_by_scope) to each running instance.
 
 !!! note
     - Multiple instances can't run with the same scope;