Make 'build permissions' consistent

[ci skip]

doc/ci/README.md

@@ -16,7 +16,7 @@
 - [Trigger builds through the API](triggers/README.md)
 - [Build artifacts](../user/project/builds/artifacts.md)
 - [User permissions](../user/permissions.md#gitlab-ci)
-- [Build permissions](../user/permissions.md#builds-permissions)
+- [Build permissions](../user/permissions.md#build-permissions)
 - [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) 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.

doc/user/permissions.md

@@ -139,11 +139,11 @@ instance and project. In addition, all admins can use the admin interface under
 | See events in the system              |                 |             |          | ✓      |
 | Admin interface                       |                 |             |          | ✓      |
 
-## Builds permissions
+### Build permissions
 
 > Changed in GitLab 8.12.
 
-GitLab 8.12 has a completely redesigned build permission system.
+GitLab 8.12 has a completely redesigned build permissions system.
 Read all about the [new model and its implications][new-mod].
 
 This table shows granted privileges for builds triggered by specific types of