Remove `hostname` and `port` from JDBC examples to avoid confus… (#1786)
Remove `hostname` and `port` from JDBC examples to avoid confus… (#1786)

* Remove `hostname` and `port` from JDBC examples to avoid confusion

* restore original URL

* Explain the host-less URIs

outofcoffee/testcontainers-java,testcontainers/testcontainers-java,rnorth/test-containers,testcontainers/testcontainers-java,rnorth/test-containers,outofcoffee/testcontainers-java,testcontainers/testcontainers-java,rnorth/test-containers,outofcoffee/testcontainers-java