Update docs/installation.rst
Update docs/installation.rst

Co-authored-by: Maksim Rakitin <80296ac3c2ec8894fe3994152b21dee0e30396ec@users.noreply.github.com>
NSLS-II-HXN/PyXRF,NSLS-II/PyXRF,NSLS-II-HXN/PyXRF