Using a more consistent usage regarding the interaction between `target`, `user_id` and `chat_id`.
The `target` can be both a `user_id` or a `target_id`, leaving the `user_id` (which was the original one). But the `chat_id` parameters should be a `chat_id` identificator, for consistency.
Also updated the description for `target` parameter on Telegram calls.
ce0b046bca
