Description
I think the section of Cleaning the environment in this document is confusable for new comers.
https://github.com/apache/airflow/blob/master/BREEZE.rst#cleaning-the-environment

Actual
Suddenly, ./breeze stop appears in the document. It's not necessary for those who first run breeze.

Exepected
It's better to write the condition like below.
Stop Breeze with ./breeze stop. (If Breeze is already running)

Use case / motivation
Because ./breeze stop. is not required for new comers, it's better to write the condition.

Are you willing to submit a PR?
Yes, I'm ready.