doc update for shared VIM
After patch [1], VIM shared property set to False, that means Vim can only
be invoked by user who creates it. updating doc for the same.
[1]:
@@ -165,8 +165,8 @@ To delete a VIM :
Features
~~~~~~~~
-* VIMs are shared across tenants -- As an admin operator, the user can register
- a VIM once and allow tenants to deploy VNFs on the registered VIM.
+* Tacker support multi-tenancy, that means a VIM regisetered by one tenant can
+ not be shared with other.
* Pluggable driver module framework allowing Tacker to interact with multiple
VIM types.
* Compatible for OpenStack versions starting from Kilo.
