Fixes to common section docs

Docs on a plane returns.

A cohort of small changes, reducing cruft and improving clarity of
these common sections.

Change-Id: I11c0ee83f4b2805304bb2e84e548c0a6aeaa135e
Updated the section-dashboard-access.xml file

Updated the dashboard access section to include new screenshots
for the Admin and Project tabs and also the new options available to
users in the Havana release.
Removed the old dashboard-project.png and dashboard_admin_overview.png images.

Change-Id: Ida3cc07a2d0f4cba1aee559597352ebf97461c61
Merge "Updated the section-dashboard-access.xml file"
Merge "Fixes to common section docs"