Update Package docs to drive contributions

doc/development/packages.md

@@ -13,12 +13,13 @@ See already supported package types in [Packages documentation](../administratio
 Since GitLab packages' UI is pretty generic, it is possible to add basic new
 package system support with solely backend changes. This guide is superficial and does
 not cover the way the code should be written. However, you can find a good example
-by looking at merge requests with Maven and NPM support:
+by looking at the following merge requests:
 
 - [NPM registry support](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/8673).
-- [Conan repository](https://gitlab.com/gitlab-org/gitlab/-/issues/8248).
 - [Maven repository](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/6607).
-- [Instance level endpoint for Maven repository](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/8757)
+- [Composer repository for PHP dependencies](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/22415).
+- [Terraform modules registry](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/18834).
+- [Instance-level endpoint for Maven repository](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/8757).
 
 ## General information
 

doc/user/packages/index.md

@@ -33,8 +33,7 @@ You can also use the [API](../../api/packages.md) to administer the Package Regi
 ## Accepting contributions
 
 The below table lists formats that are not supported, but are accepting Community contributions for. Consider contributing to GitLab. This [development documentation](../../development/packages.md) will
-guide you through the process. Or check out how other members of the community
-are adding support for [PHP](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/17417) or [Terraform](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/18834).
+guide you through the process.
 
 | Format | Status |
 | ------ | ------ |