Option to share network needn't be documented

[nathanweeks]

Perhaps this option needn't be mentioned in the user docs if only administrators can see it? (Just a suggestion; if this doc is for admins too, please disregard!)

nerc-docs/docs/openstack/setting-up-a-network/set-up-a-private-network.md

Lines 21 to 22 in a12837e

	Shared: Share the network with other projects. Non admin users are not allowed
	to set shared option and not even visible to them.

[Milstein]

These lines are now removed as per your suggestion and not applicable for the general user. @nathanweeks