Description of problem: Tracker for the release 7.3
REVIEW: https://review.gluster.org/24126 (doc: Added release 7.3 notes) posted (#1) for review on release-7 by Rinku Kothiya
REVIEW: https://review.gluster.org/24126 (doc: Added release 7.3 notes) merged (#2) on release-7 by Rinku Kothiya