Documented that VCHA is supported. (#2442)

* Documented that VCHA is supported.

* Added that VCHA support comes in 1.5.4

* Removed 1.5.4 from vsphere HA and added it to VCHA.

docs/user_doc/vic_vsphere_admin/interop.md

@@ -55,6 +55,10 @@ For the most up-to-date information about compatibility with vRealize Automation
 
 You can apply vSphere High Availability to clusters on which VCHs and container VMs run. If the host on which a VCH or container VMs are running goes offline, the VCH and container VMs migrate to another host in the cluster. VCHs restart on the new host immediately. Container VMs that were running before the migration restart one by one, after the VCH has restarted. For more information about VCHs and High Availability, see [Backing Up Virtual Container Host Data](backup_vch.md).
 
+### vCenter Server High Availabilty
+
+In vSphere Integrated Containers 1.5.4 and later, you can install the vSphere Integrated Containers plugin on a vCenter Server instance that has vCenter Server High Availability enabled, and use the plugin to deploy VCHs to that highly available instance.
+
 ### Maintenance Mode <a id="maintmode"></a>
 
 In a cluster with fully automated DRS, if you put a host into maintenance mode, DRS migrates the VCHs and container VMs to another host in the cluster. Putting hosts into maintenance mode requires manual intervention in certain circumstances:
@@ -71,5 +75,4 @@ VCHs do not currently support the following vSphere features:
 - vSphere Storage DRS&trade;: You cannot configure VCHs to use Storage DRS datastore clusters. 
 - vSphere Fault Tolerance: vSphere Integrated Containers does not implement vSphere Fault Tolerance. However, VCH processes that stop unexpectedly do restart automatically, independently of vSphere Fault Tolerance.
 - vSphere Virtual Volumes&trade;: You cannot use Virtual Volumes as the target datastores for image stores or volume stores.
-- Snapshots: Creating and reverting to snapshots of the VCH endpoint VM or container VMs can cause vSphere Integrated Containers Engine not to function correctly.
-- vCenter Server High Availabilty: You cannot deploy VCHs on a highly available vCenter Server, but you can apply vSphere High Availability to clusters on which VCHs and container VMs run. For more information, see [VMware vSphere High Availability](#ha).
+- Snapshots: Creating and reverting to snapshots of the VCH endpoint VM or container VMs can cause vSphere Integrated Containers Engine not to function correctly.