Fixing ambiguity in the documetation

After change change 284856, there were some comments
about ambiguity in docs.

Change-Id: I90129c475b87bf63f2e5c870dba7bd07893c8c9c

doc/quickstart.rst

@@ -17,7 +17,8 @@ to Vagrant, use the Vagrant virtual environment documented in
 
 If evaluating Kolla, the community strongly recommends using bare metal or a
 virtual machine during the evaluation period. Follow the instructions in this
-document to get started with deploying OpenStack on bare metal with Kolla.
+document to get started with deploying OpenStack on bare metal or a virtual
+machine with Kolla.
 
 Host machine requirements
 -------------------------