Solved! Go to Solution.
These look like they've been moved. Can anyone clue us in to where the pages exist now?
Sync to SFDC Campaign: Sync an SFDC Campaign with a Program - Marketo Docs - Product Docs - add to SFDC Campaign from flow action: Add to SFDC Campaign - Marketo Docs - Product Docs , general SFDC Sync article: SFDC Sync: Campaign Sync - Marketo Docs - Product Docs