Typos and corrections in README.adoc in EAP OS image

In https://github.com/jboss-container-images/jboss-eap-7-openshift-image/blob/eap72-openjdk11-ubi8/README.adoc, it's unclear when a user should or should not specify the "-p IMAGE_STREAM_NAMESPACE=myproject" parameter in the new-app command:

oc -n myproject new-app eap72-openjdk11-basic-s2i -p APPLICATION_NAME=eap72-basic-app

By default, the image stream would be looked up in "openshift" namespace. So if a user has imported templates without "-n openshift", he should add "-p IMAGE_STREAM_NAMESPACE=myproject" to the new-app command. Otherwise the imagestream will not be found and the app build will not be triggered.

Also there's wrong image name in import-image command, and typo in the "eap72-openjdk11-image-stream.json" file name in the first command.