fix a/an grammar in obvious cases

balloon(4) is in

bring the virtualization roadmap up to date.

Update the NetBSD roadmaps to reflect recent changes.

Please contact core if you have other major projects and requirements
that you would like to see included.

Various updates to the roadmaps for features we are looking to develop
over the next few years

Formatting fixes:
- Fix underlining of titles.
- Separate subsections by one blank line only (this seemed to be the most
common style among the four documents).

Add roadmap files, outlining the directions, projects and rough indicative
timescales for new development within the

networking
storage
system
virtualization

More roadmaps will be forthcoming.

Add roadmap files, outlining the directions, projects and rough indicative
timescales for new development within the

networking
storage
system
virtualization

More roadmaps will be forthcoming.

The dates in these documents may well change, and are provided for guidance
on relative, not absolute, timescales.

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