Describe changelog quirk around beta release

This helps guide users who are reading changelogs better understand what changes are a part of a "main" release.
pypa · Nov 29, 2020 · 0579cac · 0579cac
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diff --git a/docs/html/news.rst b/docs/html/news.rst
@@ -2,4 +2,9 @@
 Changelog
 =========
 
+.. attention::
+
+    Major and minor releases of pip also include changes listed within
+    prior beta releases.
+
 .. include:: ../../NEWS.rst