Kaifeng Wang cc17246d2b Expand user-image doc
Adds some text on the general instruction on how to build
user-image by virtual machine software.

See also: https://review.opendev.org/#/c/710966/

Change-Id: Ic84bc14ff0bce609009455c644a1601f990a7b45
2020-03-16 09:38:12 +08:00
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