[Bug 1136030] Need a new chapter about upgrading Fedora

https://bugzilla.redhat.com/show_bug.cgi?id=1136030
Bug 1136030 depends on bug 1008749, which changed state.

Bug 1008749 Summary: Add info to install-guide about deleting orphaned and obsolete packages after fedup upgrade
https://bugzilla.redhat.com/show_bug.cgi?id=1008749

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |CLOSED
         Resolution|---                         |EOL