docs: def RenameInstance(r, instance, new_name, ip_check, name_check=None):
      """
      Changes the name of an instance.
  
      @type instance: string
      @param instance: Instance name
      @type new_name: string
      @param new_name: New instance name
      @type ip_check: bool
      @param ip_check: Whether to ensure instance's IP address is inactive
      @type name_check: bool
      @param name_check: Whether to ensure instance's name is resolvable
      """
  
      body = {
          "ip_check": ip_check,
          "new_name": new_name,
      }
  
      if name_check is not None:
          body["name_check"] = name_check
  
      return r.request("put", "/2/instances/%s/rename" % instance, content=body)