BZ:1889248 add licenses param

Author: jldohmann

modules/installation-configuration-parameters.adoc

@@ -909,7 +909,7 @@ ifdef::gcp[]
 Additional GCP configuration parameters are described in the following table:
 
 .Additional GCP parameters
-[cols=".^2,.^3a,.^3a",options="header"]
+[cols=".^1,.^6a,.^3a",options="header"]
 |====
 |Parameter|Description|Values
 
@@ -938,6 +938,14 @@ link:https://yaml.org/spec/1.2/spec.html#sequence//[YAML sequence].
 |The name of the existing subnet in your VPC that you want to deploy your compute machines to.
 |The subnet name.
 
+|`platform.gcp.licenses`
+|A list of license URLs that must be applied to the compute images.
+[IMPORTANT]
+====
+The `licenses` parameter is a deprecated field and nested virtualization is enabled by default. It is not recommended to use this field.
+====
+|Any license available with the link:https://cloud.google.com/compute/docs/reference/rest/v1/licenses/list[license API], such as the license to enable link:https://cloud.google.com/compute/docs/instances/nested-virtualization/overview[nested virtualization]. You cannot use this parameter with a mechanism that generates pre-built images. Using a license URL forces the installer to copy the source image before use.
+
 |`platform.gcp.osDisk.diskSizeGB`
 |The size of the disk in gigabytes (GB).
 |Any size between 16 GB and 65536 GB.