OCPBUGS-32274:correcting support platforms text

Author: brendan-daly-red-hat

modules/install-sno-requirements-for-installing-on-a-single-node.adoc

@@ -22,8 +22,11 @@ ISO is not required for {ibm-z-name} installations.
 
 * *CPU Architecture:* Installing {product-title} on a single node supports `x86_64`, `arm64`,`ppc64le`, and `s390x` CPU architectures.
 
-* *Supported platforms:* Installing {product-title} on a single node is supported on bare metal, vSphere, AWS cloud, Red Hat OpenStack, {VirtProductName}, {ibm-power-name}, and {ibm-z-name} platforms.
-
+* *Supported platforms:*
+Installing {product-title} on a single node is supported on bare metal and link:https://access.redhat.com/articles/973163[Certified third-party hypervisors]. In most cases, you must specify the `platform.none: {}` parameter in the `install-config.yaml` configuration file. The following list shows the only exceptions and the corresponding parameter to specify in the `install-config.yaml` configuration file:
+** {aws-first}, where you use `platform=aws`
+** {gcp-first}, where you use `platform=gcp`
+** {azure-first}, where you use `platform=azure`
 * *Production-grade server:* Installing {product-title} on a single node requires a server with sufficient resources to run {product-title} services and a production workload.
 +
 .Minimum resource requirements