[3.10] bpo-43882 - Mention urllib.parse changes in Whats new section. (GH-26275)

* [3.10] bpo-43882 - Mention urllib.parse changes in Whats new section.

* escape the \n chars, ReSTify :rfc:, urllib.parse is a :mod:

* minor formatting.

Co-authored-by: Gregory P. Smith <greg@krypto.org>
1 file changed