Rewrite introduction to compression package to be more timeless

Author: emmatyping

Doc/library/compression.rst

@@ -3,12 +3,12 @@ The :mod:`!compression` package
 
 .. versionadded:: 3.14
 
-.. attention::
-
-   The :mod:`!compression` package is the new location for the data compression
-   modules in the standard library, listed below. The existing modules are not
-   deprecated and will not be removed before Python 3.19. The new ``compression.*``
-   import names are encouraged for use where practical.
+The :mod:`!compression` package contains the canonical compression modules
+containing interfaces to several different compression algorithms. Some of
+these modules have historically been available as separate modules; those will
+continue to be available under their original names for compatibility reasons,
+and will not be removed without a deprecation cycle. The use of modules in
+:mod:`!compression` is encouraged where practical.
 
 * :mod:`!compression.bz2` -- Re-exports :mod:`bz2`
 * :mod:`!compression.gzip` -- Re-exports :mod:`gzip`