[release] Add 3.2.1 and 3.2.2 release notes from stable

Change-Id: I5da5d7154a04da8de062a489a13b69cee0779710
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/339402
Reviewed-by: Samuel Rawlins <srawlins@google.com>

Author: athomas

CHANGELOG.md

@@ -71,7 +71,37 @@
 
 [`collection_methods_unrelated_type`]: https://dart.dev/lints/collection_methods_unrelated_type
 
-## 3.2.0
+## 3.2.2 - 2023-11-29
+
+This is a patch release that:
+
+- Adjusts the nullablity computations in the implementation of the
+  upper bound algorithm in the CFE (issue [#53999][]).
+
+- Fixes missing closure code completion entries for function parameters
+  (issue [#54112][]) for LSP-based editors like VS Code.
+
+[#53999]: https://github.com/dart-lang/sdk/issues/53999
+[#54112]: https://github.com/dart-lang/sdk/issues/54112
+
+## 3.2.1 - 2023-11-22
+
+This is a patch release that:
+
+- Fixes the left/mobile sidebar being empty on non-class pages
+  in documentation generated with `dart doc` (issue [#54073][]).
+
+- Fixes a JSON array parsing bug that causes seg fault when --coverage is used.
+  This bug has been reported by flutter customers here
+  https://github.com/flutter/flutter/issues/124145 (issue [#54059][])
+
+- Upgrades Dart DevTools to version 2.28.3 (issue [#54085][])
+
+[#54073]: https://github.com/dart-lang/sdk/issues/54073
+[#54059]: https://github.com/dart-lang/sdk/issues/54059
+[#54085]: https://github.com/dart-lang/sdk/issues/54085
+
+## 3.2.0 - 2023-11-15
 
 ### Language