Merge branch 'id-json_limited_encoder-details' into 'master'

Fill details about json_limited_encoder FF

See merge request gitlab-org/gitlab!44434

config/feature_flags/development/json_limited_encoder.yml

 ---
 name: json_limited_encoder
-introduced_by_url: 
-rollout_issue_url: 
-group: 
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/38687
+rollout_issue_url:
+group: group::source code
 type: development
 default_enabled: false