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No operating system will use that by default. Host with a random number (like Host82938) might be a better option. I suggest using “host” as is recommended for other operating systems. Go to the virtual machine window menu > Devices > CD/DVD devices > Choose a virtual disk. With Linux you act like you are burning a data disk with Brasero, and it gives you the option to create an iso. Instead of sharing folders you can create iso’s to make files available in the virtual machines. If the first editor writes the documentation for Ubuntu 12.04.3 then someone finds that nothing has changed with Ubuntu 12.04.4, they can change the introduction or section titles to Ubuntu 12.04.3/12.04.4. Include the version numbers (of Ubuntu, Torbrowser, etc) that the documentation applies to.
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These are some changes I would make to the documentation unless someone has a better idea:
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