Add a small description mentioning submodules/LFS

doc/ci/README.md

@@ -17,7 +17,6 @@
 - [Build artifacts](../user/project/builds/artifacts.md)
 - [User permissions](../user/permissions.md#gitlab-ci)
 - [Build permissions](../user/permissions.md#builds-permissions)
-- [Access dependent projects](dependent_projects/README.md)
 - [API](../api/ci/README.md)
 - [CI services (linked docker containers)](services/README.md)
-- [**New CI build permissions model**](../user/project/new_ci_build_permissions_model.md)
+- [**New CI build permissions model**](../user/project/new_ci_build_permissions_model.md) Read about what changed in GitLab 8.12 and how that affects your builds. There's a new way to access your submodules and LFS objects in builds.