Update docs/source/quickinstall.rst
Update docs/source/quickinstall.rst

I was thinking about creating a new env also. Thanks for the suggestion.

Co-authored-by: Paul Romano <a436801bae4f27296736e9545e95ef593e23fd3e@gmail.com>
amandalund/openmc,shikhar413/openmc,mit-crpg/openmc,smharper/openmc,liangjg/openmc,walshjon/openmc,paulromano/openmc,walshjon/openmc,smharper/openmc,liangjg/openmc,shikhar413/openmc,amandalund/openmc,amandalund/openmc,liangjg/openmc,mit-crpg/openmc,liangjg/openmc,smharper/openmc,shikhar413/openmc,paulromano/openmc,shikhar413/openmc,walshjon/openmc,paulromano/openmc,amandalund/openmc,mit-crpg/openmc,smharper/openmc,mit-crpg/openmc,paulromano/openmc,walshjon/openmc