OSSMDOC-362: Update version in prereqs

Author: Tim O'Keefe

service_mesh/v2x/preparing-ossm-installation.adoc

@@ -16,8 +16,8 @@ Before you can install {ProductName}, you must subscribe to {product-title} and
 ** xref:../../installing/installing_aws/installing-aws-user-infra.adoc#installing-aws-user-infra[Install {product-title} {product-version} on user-provisioned AWS]
 ** xref:../../installing/installing_bare_metal/installing-bare-metal.adoc#installing-bare-metal[Install {product-title} {product-version} on bare metal]
 ** xref:../../installing/installing_vsphere/installing-vsphere.adoc#installing-vsphere[Install {product-title} {product-version} on vSphere]
-** xref:../../installing/installing_ibm_z/installing-ibm-z.adoc#installing-ibm-z[Install {product-title} 4.6 on IBM Z and LinuxONE]
-** xref:../../installing/installing_ibm_power/installing-ibm-power.adoc#installing-ibm-power[Install {product-title} 4.6 on IBM Power Systems]
+** xref:../../installing/installing_ibm_z/installing-ibm-z.adoc#installing-ibm-z[Install {product-title} {product-version} on IBM Z and LinuxONE]
+** xref:../../installing/installing_ibm_power/installing-ibm-power.adoc#installing-ibm-power[Install {product-title} {product-version} on IBM Power Systems]
 +
 * Install the version of the {product-title} command line utility (the `oc` client tool) that matches your {product-title} version and add it to your path.
 ** If you are using {product-title} {product-version}, see xref:../../cli_reference/openshift_cli/getting-started-cli.adoc#cli-about-cli_cli-developer-commands[About the OpenShift CLI].