Docs update for Job Backoff Limit Per Index in Beta

Author: mimowo

content/en/docs/concepts/workloads/controllers/job.md

@@ -382,7 +382,7 @@ from failed Jobs is not lost inadvertently.
 
 ### Backoff limit per index {#backoff-limit-per-index}
 
-{{< feature-state for_k8s_version="v1.28" state="alpha" >}}
+{{< feature-state for_k8s_version="v1.29" state="beta" >}}
 
 {{< note >}}
 You can only configure the backoff limit per index for an [Indexed](#completion-mode) Job, if you

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

@@ -114,7 +114,8 @@ For a reference to old feature gates that are removed, please refer to
 | `InTreePluginOpenStackUnregister` | `false` | Alpha | 1.21 | |
 | `InTreePluginPortworxUnregister` | `false` | Alpha | 1.23 | |
 | `InTreePluginvSphereUnregister` | `false` | Alpha | 1.21 | |
-| `JobBackoffLimitPerIndex` | `false` | Alpha | 1.28 | |
+| `JobBackoffLimitPerIndex` | `false` | Alpha | 1.28 | 1.28 |
+| `JobBackoffLimitPerIndex` | `true` | Beta | 1.29 | |
 | `JobPodFailurePolicy` | `false` | Alpha | 1.25 | 1.25 |
 | `JobPodFailurePolicy` | `true` | Beta | 1.26 | |
 | `JobPodReplacementPolicy` | `false` | Alpha | 1.28 | |