Add codeowners for ci and linting dirs

.gitlab/CODEOWNERS

@@ -7,11 +7,12 @@
 *.rake @gitlab-org/maintainers/rails-backend
 
 # Technical writing team are the default reviewers for all markdown docs
-*.md @gl-docsteam
 /doc/ @gl-docsteam
 # Dev and Doc guidelines
 /doc/development/ @marcia @mjang1
 /doc/development/documentation/ @mikelewis
+/doc/ci @marcel.amirault @sselhorn
+/doc/.linting @marcel.amirault @eread @aqualls @mikelewis
 
 # Frontend maintainers should see everything in `app/assets/`
 *.scss @annabeldunstone @gitlab-org/maintainers/frontend