Correcting windows_feature documentation, clarifying DISM and PowerShell usage
Correcting windows_feature documentation, clarifying DISM and PowerShell usage

Signed-off-by: Stuart Preston <1c8c08db85a36cc69d975124539be839dea91342@chef.io>

GannettDigital/chef-windows,rlaveycal/windows,opscode-cookbooks/windows,daptiv/windows,chef-cookbooks/windows