Fixed Broken links at labs/README.md. Fixes docker#200.

Signed-off-by: Ricardo Henriques <ricardoaireshenriques@gmail.com>

Author: ricardo-aires

README.md

@@ -3,7 +3,7 @@
 This repo contains [Docker](https://docker.com) labs and tutorials authored both by Docker, and by members of the community. We welcome contributions and want to grow the repo.
 
 #### Docker tutorials:
-* [Docker for beginners] (beginner/readme.md)
+* [Docker for beginners](beginner/readme.md)
 * [Docker Swarm Mode](swarm-mode/README.md)
 * [Configuring developer tools and programming languages](developer-tools/README.md)
   * Java
@@ -20,7 +20,7 @@ This repo contains [Docker](https://docker.com) labs and tutorials authored both
 
 #### Community tutorials
 * [Docker Tutorials from the Community](https://github.com/docker/community/tree/master/Docker-Meetup-Content) - links to a different repository
-* [Advanced Docker orchestration workshop] (https://github.com/docker/labs/tree/master/Docker-Orchestration) - links to a different repository
+* [Advanced Docker orchestration workshop](https://github.com/docker/labs/tree/master/Docker-Orchestration) - links to a different repository
 
 For more information on Docker, see the Official [Docker documentation](https://docs.docker.com).