Add changelog section for 3.32.0 and 3.32.1, and add note for ndk checking cherry pick (#169369)

Adds a note about https://github.com/flutter/flutter/pull/169289, and
also makes the sections as they didn't exist yet.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [ ] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

---------

Co-authored-by: Gray Mackall <mackall@google.com>

CHANGELOG.md

@@ -29,6 +29,15 @@ Our goal is to make the list easy for them to scan.
 More information and tips:
 docs/releases/Hotfix-Documentation-Best-Practices.md
 -->
+## Flutter 3.32 Changes
+
+### [3.32.1](https://github.com/flutter/flutter/releases/tag/3.32.1)
+- [flutter/167011](https://github.com/flutter/flutter/pull/167011) [Android] Fix regression in NDK version checking for projects with old AGP versions.
+- [flutter/168847](https://github.com/flutter/flutter/pull/168847) [Widget Inspector] Fix missing cupertino icon in on-device inspector.
+
+### [3.32.0](https://github.com/flutter/flutter/releases/tag/3.32.0)
+Initial stable release.
+
 ## Flutter 3.29 Changes
 
 ### [3.29.3](https://github.com/flutter/flutter/releases/tag/3.29.3)