I don't think the date methods belong in the "Message Basics" section. 

I had to read through the API docs to figure out which date methods were available to me and what each meant. It would have been nice to have a summary of the pros and cons of each. I've tried to make that summary for people by creating a "Message Date" section with date, received_at and indexed_at subsections. 

I also think this is worth the screen real estate to discuss because without it, people may use `message.date` and later run into unexpected date issues in their apps. 

Please let me know what you think of the angle of approach and explanations themselves.