doc: Update mininum system requirements
doc: Update mininum system requirements

Fix some indentation in the file and also add some KVM requirements

jcshen007/cloudstack,jcshen007/cloudstack,resmo/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,jcshen007/cloudstack,resmo/cloudstack,mufaddalq/cloudstack-datera-driver,DaanHoogland/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,mufaddalq/cloudstack-datera-driver,wido/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,resmo/cloudstack,mufaddalq/cloudstack-datera-driver,GabrielBrascher/cloudstack,mufaddalq/cloudstack-datera-driver,wido/cloudstack,resmo/cloudstack,mufaddalq/cloudstack-datera-driver,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,resmo/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,resmo/cloudstack,mufaddalq/cloudstack-datera-driver,DaanHoogland/cloudstack,resmo/cloudstack