Update install.rst
Update install.rst

Minor grammatical changes
geopython/GeoHealthCheck,justb4/GeoHealthCheck,justb4/GeoHealthCheck,tomkralidis/GeoHealthCheck,tomkralidis/GeoHealthCheck,geopython/GeoHealthCheck,justb4/GeoHealthCheck,tomkralidis/GeoHealthCheck,geopython/GeoHealthCheck,tomkralidis/GeoHealthCheck,justb4/GeoHealthCheck,geopython/GeoHealthCheck