Update docs on vbox version
Update docs on vbox version

Fixes GH-7620

crashlytics/vagrant,bshurts/vagrant,marxarelli/vagrant,bryson/vagrant,taliesins/vagrant,lukebakken/vagrant,PatrickLang/vagrant,justincampbell/vagrant,PatrickLang/vagrant,crashlytics/vagrant,taliesins/vagrant,bryson/vagrant,PatrickLang/vagrant,bdwyertech/vagrant,sni/vagrant,lukebakken/vagrant,crashlytics/vagrant,kamazee/vagrant,chrisroberts/vagrant,mitchellh/vagrant,krig/vagrant,chrisroberts/vagrant,justincampbell/vagrant,crashlytics/vagrant,sni/vagrant,benizi/vagrant,gitebra/vagrant,krig/vagrant,benizi/vagrant,tomfanning/vagrant,carlosefr/vagrant,kamazee/vagrant,bdwyertech/vagrant,sni/vagrant,kamazee/vagrant,kamazee/vagrant,lonniev/vagrant,lukebakken/vagrant,gitebra/vagrant,krig/vagrant,mitchellh/vagrant,benizi/vagrant,lonniev/vagrant,mitchellh/vagrant,mwrock/vagrant,carlosefr/vagrant,chrisroberts/vagrant,signed8bit/vagrant,carlosefr/vagrant,krig/vagrant,jtopper/vagrant,bshurts/vagrant,justincampbell/vagrant,tomfanning/vagrant,lukebakken/vagrant,bdwyertech/vagrant,bshurts/vagrant,tomfanning/vagrant,taliesins/vagrant,marxarelli/vagrant,mwrock/vagrant,PatrickLang/vagrant,signed8bit/vagrant,jtopper/vagrant,tomfanning/vagrant,chrisroberts/vagrant,bryson/vagrant,marxarelli/vagrant,jtopper/vagrant,mitchellh/vagrant,justincampbell/vagrant,gitebra/vagrant,bdwyertech/vagrant,sni/vagrant,jtopper/vagrant,mwrock/vagrant,benh57/vagrant,taliesins/vagrant,benh57/vagrant,carlosefr/vagrant,marxarelli/vagrant,benh57/vagrant,mwrock/vagrant,signed8bit/vagrant,signed8bit/vagrant,benizi/vagrant,bryson/vagrant,lonniev/vagrant,benh57/vagrant,bshurts/vagrant,gitebra/vagrant,lonniev/vagrant