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

Author: linfraze

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

@@ -273,7 +273,7 @@ helm install _<rhdh_instance>_ _<workspace_directory>_/_<results_directory>_/cha
 --
 where:
 
-`<rhdh_instance>` :: Specifies the name of your {product} instance, for example, `my-rhdh`
+`<rhdh_instance>` :: Specifies the name of your {product} instance, for example, `my-rhdh`.
 
 `<workspace_directory>` :: Specifies the name of your workspace directory, for example, `oc-mirror-workspace`.