Minor typo in virtual environments

[cbedwards-dfw]

https://phac-modelling-hub.github.io/dev-practices/projects/virtual-environments.html

"Also, since you can usually save the state of your virtual environment one or a few simple files and then distribute this ‘snapshot’ with your project," -->

"Also, since you can usually save the state of your virtual environment in one or a few simple files and then distribute this ‘snapshot’ with your project,"