ubuntu-docs Documentation Freeze exception to add Desktop Sharing pages

[Jeremy Bicha]

Hi,

I'd like to break the documentation freeze to add the Desktop Sharing
pages from GNOME. This will show when users click the Help button in
the Desktop Sharing app so it's important that the Help button works.

Also in this commit is a single typo fix for "envelop".

http://bazaar.launchpad.net/~ubuntu-core-doc/ubuntu-docs/oneiric/revision/48

Thanks,
Jeremy