Enable github_importer_use_diff_note_with_suggestions by default

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/340624

Changelog: added
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/74096

config/feature_flags/development/github_importer_use_diff_note_with_suggestions.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/344309
 milestone: '14.5'
 type: development
 group: group::import
-default_enabled: false
+default_enabled: true

doc/user/project/import/github.md

@@ -26,6 +26,7 @@ The following aspects of a project are imported:
 - Regular issue and pull request comments
 - [Git Large File Storage (LFS) Objects](../../../topics/git/lfs/index.md)
 - Pull request comments replies in discussions ([GitLab.com & 14.5+](https://gitlab.com/gitlab-org/gitlab/-/issues/336596))
+- Diff Notes suggestions ([GitLab.com & 14.7+](https://gitlab.com/gitlab-org/gitlab/-/issues/340624)) [with a flag](../../../administration/feature_flags.md) named `github_importer_use_diff_note_with_suggestions`. Enabled by default.
 
 References to pull requests and issues are preserved (GitLab.com & 8.7+), and
 each imported repository maintains visibility level unless that [visibility