Correct xen-evtchn URL

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Remove < > from around "vmname"

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
We claimed we were opening the file RO .. but weren't

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Replace the mention of lwt, because we weren't using a blocking fn anyway!

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Merge pull request #94 from djs55/update-xen-disk

Work in progress: Correct a few typos in previously merge blog post