Change __repr__ to use list literal notation

A little clearer than using tuple notation, but still roundtrips.
Add comment stating that we want to roundtrip.

Author: Techcable

src/techcable/orderedset/_orderedset.py

@@ -212,7 +212,8 @@ def copy(self) -> OrderedSet[T]:
 
     @override
     def __repr__(self) -> str:
-        return f"OrderedSet(({', '.join(map(repr, self))}))"
+        # by convention, this should roundtrip through eval
+        return f"OrderedSet([{', '.join(map(repr, self))}])"
 
     @override
     def __str__(self) -> str: