[VAULT] Fix release notes links (#1167)

* Convert links to HTML
* Correct nesting for deprecation entries

Author: schavis

content/vault/v1.21.x/content/docs/updates/release-notes.mdx

@@ -9,7 +9,7 @@ description: >-
 
 Release | RC date    | GA date
 ------- | ---------- | ----------
-1.21.x  | 2025-10-09 | 2025-10-17
+1.21.x  | 2025-10-09 | 2025-10-22
 
 @include 'release-notes/intro.mdx'
 
@@ -176,9 +176,9 @@ and provides increased pricing support.
   <tr>
     <td>Eventing in the LDAP Secrets Engine</td>
     <td>
-      The LDAP secrets engine now
-      [emits events](/vault/docs/concepts/events#event-types) including rotation
-      success and failure events.
+      The LDAP secrets engine
+      now <a href="/vault/docs/concepts/events#event-types">emits events</a> including
+      rotation success and failure events.
     </td>
     <td>
       Expands functionality of the LDAP secrets engine plugin with new events.
@@ -209,9 +209,8 @@ and provides increased pricing support.
     <td>License utilization and product usage data updates</td>
     <td>
       Vault collects and reports additional data points to HashiCorp for
-      improved
-      [license utilization reporting](../license/utilization/auto-reporting) and
-      [anonymized product usage reporting](../license/product-usage-reporting).
+      improved <a href="/vault/docs/license/utilization/auto-reporting">license utilization reporting</a> and
+      <a href="/vault/docs/license/product-usage-reporting">anonymized product usage reporting</a>.
     </td>
     <td>
       Improved product insights and roadmap prioritization.
@@ -243,7 +242,7 @@ None.
     <td>Vault Secrets Operator</td>
     <td>
       Map Vault secrets directly into application pods with shared volumes
-      as [protected secrets using CSI drivers](/vault/docs/deploy/kubernetes/vso/csi).
+      as <a href="/vault/docs/deploy/kubernetes/vso/csi">protected secrets using CSI drivers</a>.
     </td>
     <td>
       Deliver secrets from Vault to Kubernetes workloads in deployments that

content/vault/v1.21.x/content/partials/deprecation/active-directory-secrets-engine.mdx

@@ -1,4 +1,4 @@
-## Active Directory secrets engine ((#ad-secrets-engine))
+### Active Directory secrets engine ((#ad-secrets-engine))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |

content/vault/v1.21.x/content/partials/deprecation/aws-field-change.mdx

@@ -1,4 +1,4 @@
-##  AWS secrets engine field change ((#aws-field-change))
+###  AWS secrets engine field change ((#aws-field-change))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |

content/vault/v1.21.x/content/partials/deprecation/azure-password-policy.mdx

@@ -1,4 +1,4 @@
-## Azure secrets password policy ((#azure-password-policy))
+### Azure secrets password policy ((#azure-password-policy))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |

content/vault/v1.21.x/content/partials/deprecation/centrify-auth-method.mdx

@@ -1,4 +1,4 @@
-## Centrify auth method ((#centrify-auht-method))
+### Centrify auth method ((#centrify-auht-method))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |

content/vault/v1.21.x/content/partials/deprecation/duplicate-hcl-attributes.mdx

@@ -1,4 +1,4 @@
-## Duplicate HCL attributes ((#duplicate-hcl-attributes))
+### Duplicate HCL attributes ((#duplicate-hcl-attributes))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |

content/vault/v1.21.x/content/partials/deprecation/duplicative-docker-images.mdx

@@ -1,4 +1,4 @@
-## Duplicative Docker images ((#duplicative-docker-images))
+### Duplicative Docker images ((#duplicative-docker-images))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |

content/vault/v1.21.x/content/partials/deprecation/internal-counters-tokens-api.mdx

@@ -1,4 +1,4 @@
-## Internal counters tokens API ((#internal-counters-tokens-api))
+### Internal counters tokens API ((#internal-counters-tokens-api))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |

content/vault/v1.21.x/content/partials/deprecation/list-allowed-parameters.mdx

@@ -1,4 +1,4 @@
-## Exact-match list comparison on allowed_parameters and denied_parameters ((#list-allowed-parameters-deprecation))
+### Exact-match list comparison on allowed_parameters and denied_parameters ((#list-allowed-parameters-deprecation))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |

content/vault/v1.21.x/content/partials/deprecation/ruby-client-library.mdx

@@ -1,4 +1,4 @@
-## Ruby client libraries ((#ruby-client-lib))
+### Ruby client libraries ((#ruby-client-lib))
 
 | Announced | Expected end of support | Expected removal |
 | :-------: | :---------------------: | :--------------: |