fixes - sidecar containers graduated to stable in 1.33

Author: antechrestos

content/en/docs/concepts/workloads/pods/sidecar-containers.md

@@ -5,7 +5,7 @@ weight: 50
 ---
 
 <!-- overview -->
-{{< feature-state for_k8s_version="v1.29" state="beta" >}}
+{{< feature-state feature_gate_name="SidecarContainers" >}}
 
 Sidecar containers are the secondary containers that run along with the main
 application container within the same {{< glossary_tooltip text="Pod" term_id="pod" >}}.