core: clarify usage of classmethods in World class (#1449)

worlds/AutoWorld.py

@@ -188,10 +188,11 @@ class World(metaclass=AutoWorldRegister):
     # can also be implemented as a classmethod and called "stage_<original_name>",
     # in that case the MultiWorld object is passed as an argument and it gets called once for the entire multiworld.
     # An example of this can be found in alttp as stage_pre_fill
+
     @classmethod
-    def assert_generate(cls) -> None:
+    def stage_assert_generate(cls, multiworld: "MultiWorld") -> None:
         """Checks that a game is capable of generating, usually checks for some base file like a ROM.
-        Not run for unittests since they don't produce output"""
+        This gets called once per present world type. Not run for unittests since they don't produce output"""
         pass
 
     def generate_early(self) -> None:
@@ -213,14 +214,12 @@ class World(metaclass=AutoWorldRegister):
         """Optional method that is supposed to be used for special fill stages. This is run *after* plando."""
         pass
 
-    @classmethod
-    def fill_hook(cls,
+    def fill_hook(self,
                   progitempool: List["Item"],
                   usefulitempool: List["Item"],
                   filleritempool: List["Item"],
                   fill_locations: List["Location"]) -> None:
-        """Special method that gets called as part of distribute_items_restrictive (main fill).
-        This gets called once per present world type."""
+        """Special method that gets called as part of distribute_items_restrictive (main fill)."""
         pass
 
     def post_fill(self) -> None: