Docs: Update configure-docker.md (#28127)

Bumpt container image to 7.2.x

docs/sources/administration/configure-docker.md

@@ -38,7 +38,7 @@ mkdir data # creates a folder for your data
 ID=$(id -u) # saves your user id in the ID variable
 
 # starts grafana with your user id and using the data folder
-docker run -d --user $ID --volume "$PWD/data:/var/lib/grafana" -p 3000:3000 grafana/grafana:5.1.0
+docker run -d --user $ID --volume "$PWD/data:/var/lib/grafana" -p 3000:3000 grafana/grafana:7.2.1
 ```
 
 ## Default paths