remove commented out type hints

These aren't used or referenced anywhere.

Author: EFord36

rdflib/graph.py

@@ -105,8 +105,6 @@
 _TripleOrQuadSelectorType = Union["_TripleSelectorType", "_QuadSelectorType"]
 _TriplePathType = Tuple["_SubjectType", Path, "_ObjectType"]
 _TripleOrTriplePathType = Union["_TripleType", "_TriplePathType"]
-# _QuadPathType = Tuple["_SubjectType", Path, "_ObjectType", "_ContextType"]
-# _QuadOrQuadPathType = Union["_QuadType", "_QuadPathType"]
 
 _GraphT = TypeVar("_GraphT", bound="Graph")
 _ConjunctiveGraphT = TypeVar("_ConjunctiveGraphT", bound="ConjunctiveGraph")