fix shortcode "note"

Signed-off-by: Gang Li <[email protected]>

Author: gangli113

content/en/docs/v3.6/feature-gates/index.md

@@ -71,10 +71,9 @@ A *Beta* feature means:
   incompatible changes in subsequent releases. If you have multiple clusters
   that can be upgraded independently, you may be able to relax this restriction.
 
-{{< note >}}
+**Note:**
 Please do try *Beta* features and give feedback on them!
 After they exit beta, it may not be practical for us to make more changes.
-{{< /note >}}
 
 A *General Availability* (GA) feature is also referred to as a *stable* feature. It means: