Update reference to the size of PyPI (python#99076)

Update reference to the size of PyPI

Last changed in 2008 (5285760).

Doc/library/index.rst

@@ -27,8 +27,8 @@ as a collection of packages, so it may be necessary to use the packaging
 tools provided with the operating system to obtain some or all of the
 optional components.
 
-In addition to the standard library, there is a growing collection of
-several thousand components (from individual programs and modules to
+In addition to the standard library, there is an active collection of
+hundreds of thousands of components (from individual programs and modules to
 packages and entire application development frameworks), available from
 the `Python Package Index <https://pypi.org>`_.