Update application.properties settings to match docker command

[aguibert]

In the hibernate orm guide we tell users to add the following to their application.properties:

# configure your datasource
quarkus.datasource.url = jdbc:postgresql://localhost:5432/mydatabase
quarkus.datasource.driver = org.postgresql.Driver
quarkus.datasource.username = sarah
quarkus.datasource.password = connor

And then later suggest that they can start a PostgreSQL database in a docker container with the following command:

docker run --ulimit memlock=-1:-1 -it --rm=true --memory-swappiness=0 \
           --name postgres-quarkus-hibernate -e POSTGRES_USER=hibernate \
           -e POSTGRES_PASSWORD=hibernate -e POSTGRES_DB=hibernate_db \
           -p 5432:5432 postgres:10.5

This docker command is a very useful tip, but we should have it match what we told people to put in their applicaiton.properties from earlier in the guide.

[gsmet]

Makes sense.

[gsmet]

Thanks, merged.