revision of lab000-virtualbox-basics

Editoral review of the chapter:

Replaced <guilabel> with proper sections.
Use <note> and <warning>.
Use proper links.
removed the, removed But, removed Instance
added “a” before better, removed unnecessary sentence
removed another unnecessary sentence
privilege to plural, added “to” to sentence
. to :
changed sentence to start with “to check”
added in this example
be deploying to deploy
added space and removed sentence that didn’t make sense
removed extra “up” and added “an”
removed Which capitalization added the before rest
could to can, that to than
fro… to from. added the before scope
GUIDE to guide
removed unnecessary sentence
removed unnecessary sentence, removed extra space
changed sentence from “you don’t know what you’re doing”
removed extra space before :
added the before rest, and changed sentences
changed sentences, added the before OpenStack
changed 3 to VM, added another the
times doesn’t need to be plural
removed space after :

Change-Id: I54ad1abb4d789489b11b62ef8f1e4b28d7e22303
Merge "revision of lab000-virtualbox-basics"