Add headings for Immutable ConfigMaps and Secrets

Author: Tim Bannister

content/en/docs/concepts/configuration/configmap.md

@@ -213,6 +213,8 @@ when new keys are projected to the Pod can be as long as the kubelet sync period
 propagation delay, where the cache propagation delay depends on the chosen cache type
 (it equals to watch propagation delay, ttl of cache, or zero correspondingly).
 
+## Immutable ConfigMaps {#configmap-immutable}
+
 {{< feature-state for_k8s_version="v1.19" state="beta" >}}
 
 The Kubernetes beta feature _Immutable Secrets and ConfigMaps_ provides an option to set

content/en/docs/concepts/configuration/secret.md

@@ -717,38 +717,6 @@ A container using a Secret as a
 Secret updates.
 {{< /note >}}
 
-{{< feature-state for_k8s_version="v1.19" state="beta" >}}
-
-The Kubernetes beta feature _Immutable Secrets and ConfigMaps_ provides an option to set
-individual Secrets and ConfigMaps as immutable. For clusters that extensively use Secrets
-(at least tens of thousands of unique Secret to Pod mounts), preventing changes to their
-data has the following advantages:
-
-- protects you from accidental (or unwanted) updates that could cause applications outages
-- improves performance of your cluster by significantly reducing load on kube-apiserver, by
-closing watches for secrets marked as immutable.
-
-This feature is controlled by the `ImmutableEphemeralVolumes` [feature
-gate](/docs/reference/command-line-tools-reference/feature-gates/),
-which is enabled by default since v1.19. You can create an immutable
-Secret by setting the `immutable` field to `true`. For example,
-```yaml
-apiVersion: v1
-kind: Secret
-metadata:
-  ...
-data:
-  ...
-immutable: true
-```
-
-{{< note >}}
-Once a Secret or ConfigMap is marked as immutable, it is _not_ possible to revert this change
-nor to mutate the contents of the `data` field. You can only delete and recreate the Secret.
-Existing Pods maintain a mount point to the deleted Secret - it is recommended to recreate
-these pods.
-{{< /note >}}
-
 ### Using Secrets as environment variables
 
 To use a secret in an {{< glossary_tooltip text="environment variable" term_id="container-env-variables" >}}
@@ -809,6 +777,40 @@ The output is similar to:
 1f2d1e2e67df
 ```
 
+## Immutable Secrets {#secret-immutable}
+
+{{< feature-state for_k8s_version="v1.19" state="beta" >}}
+
+The Kubernetes beta feature _Immutable Secrets and ConfigMaps_ provides an option to set
+individual Secrets and ConfigMaps as immutable. For clusters that extensively use Secrets
+(at least tens of thousands of unique Secret to Pod mounts), preventing changes to their
+data has the following advantages:
+
+- protects you from accidental (or unwanted) updates that could cause applications outages
+- improves performance of your cluster by significantly reducing load on kube-apiserver, by
+closing watches for secrets marked as immutable.
+
+This feature is controlled by the `ImmutableEphemeralVolumes` [feature
+gate](/docs/reference/command-line-tools-reference/feature-gates/),
+which is enabled by default since v1.19. You can create an immutable
+Secret by setting the `immutable` field to `true`. For example,
+```yaml
+apiVersion: v1
+kind: Secret
+metadata:
+  ...
+data:
+  ...
+immutable: true
+```
+
+{{< note >}}
+Once a Secret or ConfigMap is marked as immutable, it is _not_ possible to revert this change
+nor to mutate the contents of the `data` field. You can only delete and recreate the Secret.
+Existing Pods maintain a mount point to the deleted Secret - it is recommended to recreate
+these pods.
+{{< /note >}}
+
 ### Using imagePullSecrets
 
 The `imagePullSecrets` field is a list of references to secrets in the same namespace.