closes #3372
add doctstring and move comment there

… to args

change all methods except for `.copy_message()`,
which doesn't call `._send_message()`

lemontree210 changed the title refactor: add caption, caption_entities parameters to Bot._send_message refactor: add caption, parse_mode, caption_entities parameters to Bot._send_message

lemontree210 changed the title refactor: add caption, parse_mode, caption_entities parameters to Bot._send_message add caption, parse_mode, caption_entities parameters to Bot._send_message