Update openshift_debug.adoc

Where necessary, changed instances of OpenShift server to OpenShift Application as per JBQA-11190
JBIDE-18698 Remove item from server n&n that was reverted later

4.2.0.Beta2 What's new contains an item about JBIDE-17076.
But this was reverted later. As a consequence, 4.2.0.Final What's New
contains an item, which is not really there. So it's better to remove
it altogether from the page.
fix typo