Add virtualization extension requirement to help section
Add virtualization extension requirement to help section

Split out information for developing under a Windows host with Linux guest; during testing Vagrant failed to launch the VM successfully without ``Virtualize Intel VT-x/EPT or AMD-V/RVI`` selected in VMware settings, without Vagrant providing any additional information aside from a generic timeout. Upon activating the setting, Vagrant launches and provisions the VM as expected.
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