Update ROSA docs

Update Red Hat documentation links.

Bump also version in the example to a more recent and supported one.

Author: andreadecorte

docs/book/src/topics/rosa/creating-a-cluster.md

@@ -93,7 +93,7 @@ Follow the guide [here](https://docs.aws.amazon.com/ROSA/latest/userguide/gettin
 
 1. Prepare the environment:
     ```bash
-    export OPENSHIFT_VERSION="4.14.5"
+    export OPENSHIFT_VERSION="4.18.23"
     export AWS_REGION="us-west-2"
     export AWS_AVAILABILITY_ZONE="us-west-2a"
     export AWS_ACCOUNT_ID="<account_id>"
@@ -151,7 +151,7 @@ Follow the guide [here](https://docs.aws.amazon.com/ROSA/latest/userguide/gettin
 
     see [Multi-tenancy](../multitenancy.md) for more details
 
-1. Finally apply the manifest to create your Rosa cluster:
+1. Finally apply the manifest to create your ROSA cluster:
     ```shell
     kubectl apply -f rosa-capi-cluster.yaml
     ```

docs/book/src/topics/rosa/index.md

@@ -7,7 +7,7 @@
 
 The AWS provider supports creating Red Hat OpenShift Service on AWS ([ROSA](https://www.redhat.com/en/technologies/cloud-computing/openshift/aws)) based cluster. Currently the following features are supported:
 
-- Provisioning/Deleting a ROSA cluster with hosted control planes ([HCP](https://docs.openshift.com/rosa/rosa_hcp/rosa-hcp-sts-creating-a-cluster-quickly.html))
+- Provisioning/Deleting a ROSA cluster with hosted control planes ([HCP](https://docs.redhat.com/en/documentation/red_hat_openshift_service_on_aws/4))
 
 The implementation introduces the following CRD kinds:
 
@@ -23,4 +23,4 @@ A new template is available in the templates folder for creating a managed ROSA
 * [Creating MachinePools](creating-rosa-machinepools.md)
 * [Upgrades](upgrades.md)
 * [External Auth Providers](external-auth.md)
-* [Support](support.md)
+* [Support](support.md)