Clarify PEP-458 acceptance

Author: joshuagl

content/news.md

@@ -10,7 +10,7 @@ The Python Software Foundation live-streams a [key generation and signing ceremo
 
 **February 15, 2020**
 
-[PEP 458](https://www.python.org/dev/peps/pep-0458/), Secure PyPI Downloads with Package Signing, is accepted and merged into the Python master.
+[PEP 458](https://www.python.org/dev/peps/pep-0458/), Secure PyPI Downloads with Package Signing, is accepted and merged into the Python Enhancement Proposals (PEP) tree.
 
 **December 19, 2019**