Quickstart typo

[willcode]

In the quickstart link: https://www.backtrader.com/docu/quickstart/quickstart.html#the-broker-says-show-me-the-money

TestStrategy.notify_order is missing the following at the end:

# Write down: no pending order
    self.order = None

Without it the buy order stays open for the entire session.

[backtrader]

There has been an update to that part and probably that got missing. Thanks for spotting it.