Update docs/docker/configuration.md

Co-authored-by: yubiuser <github@yubiuser.dev>
Signed-off-by: Adam Warner <github@adamwarner.co.uk>

docs/docker/configuration.md

@@ -1,6 +1,6 @@
 # Configuration
 
-The recommended way to configure the Pi-hole docker contianer is by utilising [environment variables](https://docs.docker.com/compose/how-tos/environment-variables/), however if you are persisting your `/etc/pihole` directory, you choose instead to set them via the web interface, or by directly editing `pihole.toml`
+The recommended way to configure the Pi-hole docker container is by utilising [environment variables](https://docs.docker.com/compose/how-tos/environment-variables/), however if you are persisting your `/etc/pihole` directory, you choose instead to set them via the web interface, or by directly editing `pihole.toml`
 
 ## Environment Variables