Add changelog for 3.6.2-RC2

Author: WojciechMazur

changelogs/3.6.2-RC2.md

@@ -0,0 +1,14 @@
+# Backported fixes
+
+- Make context bounds for poly functions a standard feature [#22019](https://github.com/scala/scala3/pull/22019)
+- Update Scala CLI to 1.5.4 (was 1.5.1) & coursier to 2.1.18 (was 2.1.13) [#22021](https://github.com/lampepfl/dotty/pull/22021)
+
+# Contributors
+
+Thank you to all the contributors who made this release possible 🎉
+
+According to `git shortlog -sn --no-merges 3.6.2-RC1..3.6.2-RC2` these are:
+
+```
+    4 Wojciech Mazur
+```s