Update docs/docker/index.md

Co-authored-by: RD WebDesign <github@rdwebdesign.com.br>
Signed-off-by: Adam Warner <github@adamwarner.co.uk>

docs/docker/index.md

@@ -1,6 +1,6 @@
 The easiset way to get up and running with Pi-hole on Docker is to use our quickstart `docker-compose.yml` template.
 
-Copy the below [Docker Compose](https://docs.docker.com/compose/) example and customise as needed
+Copy the below [Docker Compose](https://docs.docker.com/compose/) example and customise as needed:
 
 ```yaml
 # More info at https://github.com/pi-hole/docker-pi-hole/ and https://docs.pi-hole.net/