show command reply docs

[zuiderkwast]

An important part of a command is what it returns back to the client. This part of the docs is missing in the website.

It's in the replies json files in the doc repo, which contain markdown text wrapped in json array per command. This info doesn't exist anywhere else.

For reference, the way this is used for the man pages:

• Yhe strings are concatenated with double linebreaks to turn each string into a separate paragraph or bullet.
• If the content for RESP2 and RESP3 is identical, it is only displayed once.