Changes to Discard a Social Post

added the non-success response with the status 402

added the media type application/json for the response with the status 401

added the media type application/json for the response with the status 429

added the non-success response with the status 400

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 500

endpoint added