OCPBUGS-28797: Clarify banner instructions for RHCOS nodes

The instructions for remediating Linux banners on login was pretty vague
for RHCOS nodes. This commit attempts to clarify that by suggesting the
users can use the default remediation, and tweak it to fit their
use case.

linux_os/guide/system/accounts/accounts-banners/banner_etc_issue/rule.yml

@@ -7,6 +7,9 @@ description: |-
     {{% if product == "rhcos4" %}}
     To configure the system login banner create a file under
     <tt>/etc/issue.d</tt>
+
+    The Machine Configuration provided with this rule is generic. You may need
+    to adjust it accordingly to fit your usecase.
     {{% else %}}
     To configure the system login banner edit <tt>/etc/issue</tt>. Replace the
     default text with a message compliant with the local site policy or a legal
@@ -41,10 +44,15 @@ description: |-
     <tt>I've read &amp; consent to terms in IS user agreem't.</tt>
     {{% if product == "rhcos4" %}}
     <p>
-    To address this, please create a <tt>Machineconfig</tt> object with the
-    appropriate text in a drop-in file in <tt>/etc/issue.d/</tt>. Do not try to
-    edit <tt>/etc/issue</tt> directly as this is a symlink provided by the
-    Operating System.
+    To address this, please create a <tt>MachineConfig</tt> object with the
+    appropriate text in a drop-in file in <tt>/etc/issue.d/</tt>. You can also
+    use the supplied remediation, which will be available based on scan results
+    using `oc get remediations`. The default remediation is opinionated and you
+    may need to adjust the <tt>MachineConfig</tt> accordingly for your use
+    case.
+
+    Do not try to edit <tt>/etc/issue</tt> directly as this is a symlink
+    provided by the Operating System.
     </p>
     <p>
     For example, if you're using the DoD required text, the manifest would
@@ -56,7 +64,8 @@ description: |-
     metadata:
       labels:
         machineconfiguration.openshift.io/role: master
-      name: 75-master-etc-issue
+        machineconfiguration.openshift.io/role: worker
+      name: 75-banner-etc-issue
     spec:
       config:
         ignition: