docs(upgrade) instructions for 3.0 (#9404)
docs(upgrade) instructions for 3.0 (#9404)

Co-authored-by: Makito <e67d750321086d08571635e512e2105385e6c0fd@hotmail.com>
Co-authored-by: Datong Sun <88ea7fe5b18d86dd626610096bab9e86520f1a58@konghq.com>
Kong/kong,Kong/kong,Kong/kong