Add 2.7.0 section to upgrading doc (#7457)
Add 2.7.0 section to upgrading doc (#7457)

Add 2.7.0 section to Upgrading doc.

Co-authored-by: Ursula Kallio <7fe6bc33582727447614534a5277d3fb5b1ca290@grafana.com>
grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki