Add Event filter improvement to Release notes of new version

create new section on release notes for version V3.X.X and add this improvement to release notes

changed milestone to %Release 3

added ScopeDocumentation label

assigned to @pelayo.torresalonso

created branch OCF-Doc30-add-event-filter-improvement-to-release-notes-of-new-version to address this issue

mentioned in merge request !34 (merged)

mentioned in commit 38076190

closed with merge request !34 (merged)