Need docs on Facebook Messenger response template keys

[kevinthenet]

Description of Problem:
Had to add a Facebook messenger channel integration into a bot I spun up and found the Facebook Messenger docs lacking a bit especially on the special response template keys quick_replies and elements; I had to read through the Facebook channel source to figure out what was allowed/disallowed.

Overview of the Solution:
FB Messenger docs updated with additional response template information.

Definition of Done:

• Facebook channel docs updated with caveats for default buttons option and explanation of omission if more than 3 buttons were passed.
• Facebook channel docs updated with quick_replies description along with quick title character limitation mention
• Facebook channel docs updated with elements description along with pointer to Messenger docs on allowed templates
• Documentation update mentioned in the change log

[sara-tagger]

Thanks for submitting this feature request 🚀 @degiz will get back to you about it soon! ✨

[degiz]

Hey @ortsaCniveK

Great that you could connect the bot the Facebook Messenger!

Since you've just identified the issues with the current docs, maybe you can propose a PR with all the updated you've mentioned?

[kevinthenet]

Currently working on updating docs as well as doing some maintenance on that module.