Add sections to CODEOWNERS file

Signed-off-by: Rémy Coutable <remy@rymai.me>

.gitlab/CODEOWNERS

@@ -2,13 +2,12 @@
 # project here: https://gitlab.com/gitlab-org/gitlab/-/project_members
 # As described in https://docs.gitlab.com/ee/user/project/code_owners.html
 
-# Backend Maintainers are the default for all ruby files
+[Backend]
 *.rb @gitlab-org/maintainers/rails-backend
 *.rake @gitlab-org/maintainers/rails-backend
 
-# Technical writing team are the default reviewers for all markdown docs
+[Documentation]
 /doc/ @gl-docsteam
-# Doc subpaths
 /doc/administration/monitoring/ @aqualls
 /doc/development/ @marcia @mjang1
 /doc/development/documentation/ @mikelewis
@@ -19,7 +18,7 @@
 /doc/user/project/clusters @aqualls
 /doc/.vale/ @marcel.amirault @eread @aqualls @mikelewis
 
-# Frontend maintainers should see everything in `app/assets/`
+[Frontend]
 *.scss @annabeldunstone @gitlab-org/maintainers/frontend
 *.js @gitlab-org/maintainers/frontend
 /app/assets/ @gitlab-org/maintainers/frontend
@@ -29,7 +28,7 @@
 /spec/frontend/ @gitlab-org/maintainers/frontend
 /ee/spec/frontend/ @gitlab-org/maintainers/frontend
 
-# Database maintainers should review changes in `db/`
+[Database]
 /db/ @gitlab-org/maintainers/database
 /ee/db/ @gitlab-org/maintainers/database
 /lib/gitlab/background_migration/ @gitlab-org/maintainers/database
@@ -41,19 +40,7 @@
 /app/finders/ @gitlab-org/maintainers/database
 /ee/app/finders/ @gitlab-org/maintainers/database
 
-# Feature specific owners
-/ee/lib/ee/gitlab/auth/ldap/ @dblessing @mkozono
-/lib/gitlab/auth/ldap/ @dblessing @mkozono
-/lib/gitlab/ci/templates/ @nolith @dosuken123
-/lib/gitlab/ci/templates/Auto-DevOps.gitlab-ci.yml @DylanGriffith @mayra-cabrera @tkuah
-/lib/gitlab/ci/templates/Security/ @plafoucriere @gonzoyumo @twoodham @sethgitlab
-/ee/app/models/project_alias.rb @patrickbajao
-/ee/lib/api/project_aliases.rb @patrickbajao
-
-# Quality owned files
-/qa/ @gl-quality
-
-# Engineering Productivity owned files
+[Engineering Productivity]
 /.gitlab-ci.yml @gl-quality/eng-prod
 /.gitlab/ci/ @gl-quality/eng-prod
 /.gitlab/ci/docs.gitlab-ci.yml @gl-quality/eng-prod @gl-docsteam
@@ -66,16 +53,32 @@ Dangerfile @gl-quality/eng-prod
 /scripts/frontend/ @gl-quality/eng-prod @gitlab-org/maintainers/frontend
 .editorconfig @gl-quality/eng-prod
 
-# Telemetry owner files
-/ee/lib/gitlab/usage_data_counters/ @gitlab-org/growth/telemetry
-/ee/lib/ee/gitlab/usage_data.rb @gitlab-org/growth/telemetry
-/lib/gitlab/grafana_embed_usage_data.rb @gitlab-org/growth/telemetry
-/lib/gitlab/usage_data.rb @gitlab-org/growth/telemetry
-/lib/gitlab/cycle_analytics/usage_data.rb @gitlab-org/growth/telemetry
-/lib/gitlab/usage_data_counters/ @gitlab-org/growth/telemetry
+[End-to-end]
+/qa/ @gl-quality
+
+[LDAP]
+/ee/lib/ee/gitlab/auth/ldap/ @dblessing @mkozono
+/lib/gitlab/auth/ldap/ @dblessing @mkozono
+
+[Templates]
+/lib/gitlab/ci/templates/ @nolith @dosuken123
+/lib/gitlab/ci/templates/Auto-DevOps.gitlab-ci.yml @DylanGriffith @mayra-cabrera @tkuah
+/lib/gitlab/ci/templates/Security/ @plafoucriere @gonzoyumo @twoodham @sethgitlab
+
+[Project Alias]
+/ee/app/models/project_alias.rb @patrickbajao
+/ee/lib/api/project_aliases.rb @patrickbajao
 
 [Code Owners]
 /ee/lib/gitlab/code_owners.rb @reprazent @kerrizor @garyh
 /ee/lib/gitlab/code_owners/ @reprazent @kerrizor @garyh
 /ee/spec/lib/gitlab/code_owners/ @reprazent @kerrizor @garyh
 /doc/user/project/code_owners.md @reprazent @kerrizor @garyh
+
+[Telemetry]
+/ee/lib/gitlab/usage_data_counters/ @gitlab-org/growth/telemetry
+/ee/lib/ee/gitlab/usage_data.rb @gitlab-org/growth/telemetry
+/lib/gitlab/grafana_embed_usage_data.rb @gitlab-org/growth/telemetry
+/lib/gitlab/usage_data.rb @gitlab-org/growth/telemetry
+/lib/gitlab/cycle_analytics/usage_data.rb @gitlab-org/growth/telemetry
+/lib/gitlab/usage_data_counters/ @gitlab-org/growth/telemetry