Include how to sync Engage Audiences to SendGrid marketing campaigns destination

### What article on segment.com/docs is affected?

https://segment.com/docs/connections/destinations/catalog/actions-sendgrid/#sendgrid-marketing-campaigns-destination

### What part(s) of the article would you like to see updated?

This article does not walk through steps of how you can send Engage audiences to this destination. 

### Additional information

_No response_