fix(enterprose): fix link to release blog post
fix(migration-guide): change cdi dependency

change groupID in camunda-engine-cdi dependency to org.camunda.bpm
feat(rest): Adjust variable instance query docu

related to #CAM-1391
feat(modeler/customTask): add tutorial and link example
feat(user-guide/modeler): integrate custom-task section

Related to CAM-1513
fix(user-guide): add example for @Resource

-- adds a new example for @Resource declaration in the looking up a
Process Engine in JNDI section

Related to: #SUPPORT-771