Add changelog for 3.2.2-RC2

Author: Kordyjan

changelogs/3.2.2-RC2.md

@@ -0,0 +1,20 @@
+# Backported fixes
+
+- Compute completions at `typerPhase` [#16371](https://github.com/lampepfl/dotty/pull/16371)
+- Only include accessible base classes in `orDominator` [#16477](https://github.com/lampepfl/dotty/pull/16477)
+- Fix curried overloading resolution for polymorphic methods [#16485](https://github.com/lampepfl/dotty/pull/16485)
+- Teach SpaceEngine that generic tuples are irrefutable [#16051](https://github.com/lampepfl/dotty/pull/16051)
+- Fix exhaustivity warning [#16168](https://github.com/lampepfl/dotty/pull/16168)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.2.2-RC1..3.2.2-RC2` these are:
+
+```
+     3  Martin Odersky
+     3  Paweł Marks
+     2  Dale Wijnand
+     1  Som Snytt
+```