Update vsphere.rst (apache#387)

* Update vsphere.rst

update latest versions of VMware

* Update vsphere.rst

adding ref

* Update vsphere.rst

removing versions in favour of the linked reference

Author: borisstoyanov

source/installguide/hypervisor/vsphere.rst

@@ -28,7 +28,7 @@ System Requirements for vSphere Hosts
 Software requirements:
 ^^^^^^^^^^^^^^^^^^^^^^
 
--  vSphere and vCenter, versions 6.0, 6.5 or 6.7.
+-  vSphere and vCenter (see `"Supported Hypervisor Versions" <../../releasenotes/compat.html#supported-hypervisor-versions>`_)
 
    vSphere Standard is recommended. Note however that customers need to
    consider the CPU constraints in place with vSphere licensing. See