DOC: Fix cross references

docs/infrastructure/docker_registries.rst

-Docker Registry
-===============
+Docker Registies
+================
 
 Docker Registry
 ---------------

docs/infrastructure/environments.rst

 Environments
 ============
 
-For most projects, every branch / commit is automatically deployed to our :ref:`Development Server`.
+For most projects, every branch / commit is automatically deployed to our :ref:`Docker` servers.
 However, each Git ref (branch, tag) has its own environment.
 The environments will be displayed within a GitLab project on certain places: