reopen General Forum Topic
Use this method to reopen a closed 'General' topic in a forum supergroup chat. The bot must be an administrator in the chat for this to work and must have the can_manage_topics administrator rights. The topic will be automatically unhidden if it was hidden. Returns True on success.
Parameters
chat Id
Unique identifier for the target chat or username of the target supergroup (in the format @supergroupusername)