Use versionchanged syntax

Author: pythonspeed

docs/html/topics/caching.md

@@ -27,11 +27,12 @@ While this cache attempts to minimize network activity, it does not prevent
 network access altogether. If you want a local install solution that
 circumvents accessing PyPI, see {ref}`Installing from local packages`.
 
-In versions prior to 23.2, this cache was stored in a directory called `http` in
-the main cache directory (see below for its location). In 23.2 and later, a new
-cache format is used, stored in a directory called `http-v2`. If you have
-completely switched to newer versions of `pip`, you may wish to delete the old
-directory.
+```{versionchanged} 23.3
+A new cache format is now used, stored in a directory called `http-v2` (see
+below for this directory's location). Previously this cache was stored in a
+directory called `http` in the main cache directory. If you have completely
+switched to newer versions of `pip`, you may wish to delete the old directory.
+```
 
 (wheel-caching)=