Apply suggestions from code review

Co-authored-by: Billy Tat <btat@suse.com>

docs/how-to-guides/new-user-guides/authentication-permissions-and-global-configuration/custom-branding.md

@@ -6,12 +6,10 @@ title: Custom Branding
   <link rel="canonical" href="https://ranchermanager.docs.rancher.com/how-to-guides/new-user-guides/authentication-permissions-and-global-configuration/custom-branding"/>
 </head>
 
-:::note Prerequisite:
+## Prerequisite
 
 You will need to have at least cluster member permissions.
 
-:::
-
 ## Brand Configuration
 
 To configure the brand settings,