RHDHBUGS-137 fix container version in the airgap procedure (#819)

Author: themr0c

modules/installation/proc-install-rhdh-airgapped-environment-ocp-helm.adoc

@@ -63,7 +63,7 @@ For more information about registry authentication, see https://access.redhat.co
 +
 [source,terminal,source,subs="attributes+"]
 ----
-podman pull registry.redhat.io/rhdh/rhdh-hub-rhel9:{product-chart-version}
+podman pull registry.redhat.io/rhdh/rhdh-hub-rhel9:{product-version}
 ----
 +
 [source,terminal,source,subs="attributes+"]
@@ -75,7 +75,7 @@ podman pull registry.redhat.io/rhel9/postgresql-15:latest
 +
 [source,terminal,source,subs="attributes+"]
 ----
-podman push --remove-signatures registry.redhat.io/rhdh/rhdh-hub-rhel9:{product-chart-version} default-route-openshift-image-registry.<hostname>/<project_name>/rhdh-hub-rhel9:{product-chart-version}
+podman push --remove-signatures registry.redhat.io/rhdh/rhdh-hub-rhel9:{product-version} default-route-openshift-image-registry.<hostname>/<project_name>/rhdh-hub-rhel9:{product-version}
 ----
 +
 [source,terminal]