Prepare 2.2.0 (pantsbuild#11478)

[ci skip-rust]

src/python/pants/notes/2.2.x.md

@@ -6,8 +6,9 @@ This is the first release to require having a Python 3.7 or 3.8 interpreter to r
 https://raw.githubusercontent.com/pantsbuild/setup/2f079cbe4fc6a1d9d87decba51f19d7689aee69e/pants` to update your
 `./pants` script to choose the correct interpreter.
 
-This release also removes the ability to use `%(pants_bootstrapdir)s` and `%(pants_configdir)s` in
-interpolations in your config file.
+## 2.2.0 (Jan 20, 2021)
+
+The first stable release in the `2.2.x` series, with no changes since the previous `rc`!
 
 ## 2.2.0rc2 (Jan 11, 2021)