More clear description of sendJSON() method

[mildabre]

I propose describe the function of sendJSON() method more clear, in current version is written: "Příklad action-metody, která odešle data ve formátu JSON", but the data are sent not by action method, but by sendJSON() method.

Also it is important add info, that the data are both encoded into JSON and send as http response, to avoid confusing that you should pass into the method data already encoded in JSON - small difference in meaning but important!

[dg]

Thanks, both points are valid — the sending is done by sendJson(), not the action method, and it's worth making clear the method encodes the data (you pass a raw array/object, not pre-encoded JSON). I verified the signature (sendJson(mixed $data): void). Incorporated in the next commit, in both languages: "The sendJson($data) method encodes the given data into JSON, sends it as the HTTP response, and terminates the presenter. Example:" — kept the trailing "Example:" so it still introduces the code sample below. Closing since the branch can't be merged directly.