Update docstring, removing specifics.
"""Compatibility code for using CherryPy with various versions of Python.
-CherryPy 3.2 is compatible with Python versions 2.6+. This module provides a
+To retain compatibility with older Python versions, his module provides a
useful abstraction over the differences between Python versions, sometimes by
preferring a newer idiom, sometimes an older one, and sometimes a custom one.
