Update some docstrings

src/pop2net/location_designer.py

@@ -45,15 +45,12 @@ def setup(self) -> None:
     def filter(self, agent: _agent.Agent) -> bool:  # noqa: ARG002
         """Check whether the agent is meant to join this type of location.
 
-        This is a boilerplate implementation of this method which always returns True; i.e. all
-        agents will always be allowed at this location. Override this method in your own
-        implementations as you seem fit.
-
         Args:
             agent: The agent that is currently processed by the Creator.
 
         Returns:
             True if the agent is allowed to join the location, False otherwise.
+            Returns True by default.
         """
         return True
 
@@ -116,10 +113,6 @@ def melt(self) -> list[Location] | tuple[Location]:
         """
         return []
 
-    def refine(self):
-        """An action that is performed after all location instances have been created."""
-        pass
-
     def _subsplit(self, agent: _agent.Agent) -> str | float | list | None:  # noqa: ARG002
         """Splits a location instance into sub-instances to create a certain network structure.