PEP 585: clarify removal as "no sooner than" (#2778)

Co-authored-by: Hugo van Kemenade <[email protected]>

pep-0585.rst

@@ -123,9 +123,9 @@ about such deprecated usage when the target version of the checked
 program is signalled to be Python 3.9 or newer.  It's recommended to
 allow for those warnings to be silenced on a project-wide basis.
 
-The deprecated functionality will be removed from the ``typing`` module
-in the first Python version released 5 years after the release of
-Python 3.9.0.
+The deprecated functionality may eventually be removed from the ``typing``
+module. Removal will occur no sooner than Python 3.9's end of life,
+scheduled for October 2025.
 
 
 Parameters to generics are available at runtime