doc: improvements to console.markdown copy
Fix missing links. Fix styling of printf() - once #5073 lands, link to man page will be auto-generated. Fix several typos.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Fix missing links. Fix styling of printf() - once #5073 lands, link to man page will be auto-generated. Fix several typos.