Fixed grammar on Using Docker Build doc.

doc/ci/docker/using_docker_build.md

 # Using Docker Build
-GitLab CI can allows you to use Docker Engine to build and test docker-based projects.
+GitLab CI allows you to use Docker Engine to build and test docker-based projects.
 **This also allows to you to use `docker-compose` and other docker-enabled tools.**
@@ -108,5 +108,4 @@ In order to do that follow the steps:
     ```
 1. However, by enabling `--docker-privileged` you are effectively disables all security mechanisms of containers and exposing your host to privilege escalation which can lead to container breakout.
-For more information you could be interested in checking out [Runtime privilege](https://docs.docker.com/reference/run/#runtime-privilege-linux-capabilities-and-lxc-configuration).
-
+For more information you could be interested in checking out [Runtime privilege](https://docs.docker.com/reference/run/#runtime-privilege-linux-capabilities-and-lxc-configuration).
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