Drop large disclaimer, thanks to generic reimplementation

src/eko/quantities/__init__.py

@@ -5,29 +5,4 @@
 
 Few related functions are also defined here.
 
-Note
-----
-Unfortunately, Python has still some discrepancies between runtime classes and
-type hints, so it is better not to mix dataclasses and generics.
-
-E.g. before it was implemented::
-
-    @dataclasses.dataclass
-    class RunningReference(DictLike, Generic[Quantity]):
-        value: Quantity
-        scale: float
-
-but in this way it is not possible to determine that ``RunningReference`` is
-subclassing ``DictLike``, indeed::
-
-    inspect.isclass(RunningReference)       # False
-    issubclass(RunningReference, DictLike)  # raise an error, since
-                                            # RunningReference is not a class
-
-Essentially classes can be used for type hints, but types are not all classes,
-especially when they involve generics.
-
-For this reason I prefer the less elegant dynamic generation, that seems to
-preserve type hints.
-
 """