fix: remove old, incorrect docstring (apache#1166)

Author: dataders

pyiceberg/catalog/__init__.py

@@ -564,8 +564,6 @@ def drop_namespace(self, namespace: Union[str, Identifier]) -> None:
     def list_tables(self, namespace: Union[str, Identifier]) -> List[Identifier]:
         """List tables under the given namespace in the catalog.
 
-        If namespace not provided, will list all tables in the catalog.
-
         Args:
             namespace (str | Identifier): Namespace identifier to search.