> 2.Issue number for functools.lru_cache is not mentioned. If no tracker
> id/ discussion is available, checkin link can be mentioned.
There was no tracker issue for that; the checkin is r83327, but I don’t think it would be useful to mention it in whatsnew.

> 3. There is section for Popen which says, subprocess.Popen() functions
> now support with statements for auto-closing of the file descriptors.
> Not really. Only os.popen() function supports it.
You must have missed line 752 and following of Lib/functools.py.  Brian did add context management support to Popen in response to my request in #10554.