Fix shortcodes in feature-gate page

Closes: kubernetes#8883

While there is effort to fix the shortcodes in release-1.11 branch (kubernetes#8874),
this PR is targetting the master branch.

content/en/docs/reference/command-line-tools-reference/feature-gates.md

@@ -3,12 +3,12 @@ title: Feature Gates
 weight: 10
 ---
 
-{% capture overview %}
+{{% capture overview %}}
 This page contains an overview of the various feature gates an administrator
 can specify on different Kubernetes components.
-{% endcapture %}
+{{% capture %}}
 
-{% capture body %}
+{{% capture body %}}
 
 ## Overview
 
@@ -120,9 +120,10 @@ 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}
+{{< /note >}}
 
 A *GA* feature is also referred to as a *stable* feature. It means:
 
@@ -220,6 +221,5 @@ Each feature gate is designed for enabling/disabling a specific feature:
   enables the usage of [`local`](/docs/concepts/storage/volumes/#local) volume
   type when used together with the `PersistentLocalVolumes` feature gate.
 
-{% endcapture %}
+{{% /capture %}}
 
-{% include templates/concept.md %}