OSDOCS-6142: Added failureDomain.template param to vSphere docs

Author: dfitzmau

modules/installation-configuration-parameters.adoc

@@ -1756,7 +1756,11 @@ a|Multiple IP addresses
 
 |`platform.vsphere.failureDomains.zone`
 |If you define multiple failure domains for your cluster, you must attach the tag to each vCenter cluster. To define a zone, use a tag from the `openshift-zone` tag category. For a single vSphere datacenter environment, you do not need to attach a tag, but you must enter an alphanumeric value, such as `cluster`, for the parameter.
-|`String`
+|String
+
+|`platform.vsphere.failureDomains.template`
+|Specify the absolute path to a pre-existing {op-system-first} image template or virtual machine. The installation program can use the image template or virtual machine to quickly install {op-system} on vSphere hosts. Consider using this parameter as an alternative to uploading an {op-system} image on vSphere hosts. The parameter is available for use only on installer-provisioned infrastructure.
+|String
 
 |`platform.vsphere.ingressVIPs`
 |Virtual IP (VIP) addresses that you configured for cluster Ingress.
@@ -1858,7 +1862,7 @@ Optional VMware vSphere machine pool configuration parameters are described in t
 |Parameter|Description|Values
 
 |`platform.vsphere.clusterOSImage`
-|The location from which the installation program downloads the {op-system} image. You must set this parameter to perform an installation in a restricted network.
+|The location from which the installation program downloads the {op-system-first} image. Before setting a path value for this parameter, ensure that the {op-system} image's version matches the version of {op-system} that you installed on your {product-title} cluster.
 |An HTTP or HTTPS URL, optionally with a SHA-256 checksum. For example, `\https://mirror.openshift.com/images/rhcos-<version>-vmware.<architecture>.ova`.
 
 |`platform.vsphere.osDisk.diskSizeGB`