doc: replace 'HEAD' with main or master in links
Replace the word "HEAD" with the word main or master in some of the links on the docs because with "HEAD" it's return 404 page
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Replace the word "HEAD" with the word main or master in some of the links on the docs because with "HEAD" it's return 404 page