Remove references to specific Python versions, as this project and CPython are evolving over time.

Author: jaraco

docs/index.rst

@@ -10,14 +10,12 @@ versions of Python), this can eliminate the need to use the older and less
 efficient ``pkg_resources`` package.
 
 ``importlib_metadata`` supplies a backport of
-:doc:`importlib.metadata <library/importlib.metadata>` as found in
-Python 3.8 and later for earlier Python releases.  Users of
-Python 3.8 and beyond are encouraged to use the standard library module
-when possible and fall back to ``importlib_metadata`` when necessary.
-When imported on Python 3.8 and later, ``importlib_metadata`` replaces the
-DistributionFinder behavior from the stdlib, but leaves the API in tact.
-Developers looking for detailed API descriptions should refer to the Python
-3.8 standard library documentation.
+:doc:`importlib.metadata <library/importlib.metadata>`,
+enabling early access to features of future Python versions and making
+functionality available for older Python versions. Users are encouraged to
+use the Python standard library where suitable and fall back to
+this library for future compatibility. Developers looking for detailed API
+descriptions should refer to the standard library documentation.
 
 The documentation here includes a general :ref:`usage <using>` guide.