Outdated shared-resources referenced from EAP XP QS readmes

(1) https://github.com/jboss-developer/jboss-developer-shared-resources/blob/master/guides/USE_OF_EAP_HOME.adoc#use_of_product_home_and_jboss_home_variables

• uses EAP 7.1 examples - could be updated to EAP 7.3 which is latest EAP minor

(2) https://github.com/jboss-developer/jboss-developer-shared-resources/blob/master/guides/USE_JBDS.adoc#use_red_hat_jboss_developer_studio_or_eclipse_to_run_the_quickstarts

• Contains links to old JBDS docs for version 12.9, latest is 12.15.
• Contains link to old EAP docs for version 7.1, latest is 7.3

Note: there might be other outdated docs within the shared resources, but the above mentioned are referenced from EAP XP QS readmes.