chore: bad link in code snippet points to non-existent branch (redhat…

…-developer#939)

Co-authored-by: Nick Boldt <[email protected]>

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

@@ -45,7 +45,7 @@ The internal {ocp-short} cluster image registry cannot be used as a target mirro
 +
 [source,yaml,subs="attributes+"]
 ----
-curl -sSLO https://raw.githubusercontent.com/redhat-developer/rhdh-operator/{product-version}.x/.rhdh/scripts/prepare-restricted-environment.sh
+curl -sSLO https://raw.githubusercontent.com/redhat-developer/rhdh-operator/release-{product-version}/.rhdh/scripts/prepare-restricted-environment.sh
 
 # if you do not already have a target mirror registry
 # and want the script to create one for you