Promote startupProbe to GA in 1.20

Author: matthyx

content/en/docs/concepts/workloads/pods/pod-lifecycle.md

@@ -314,7 +314,7 @@ to stop.
 
 ### When should you use a startup probe?
 
-{{< feature-state for_k8s_version="v1.16" state="alpha" >}}
+{{< feature-state for_k8s_version="v1.20" state="stable" >}}
 
 Startup probes are useful for Pods that have containers that take a long time to
 come into service. Rather than set a long liveness interval, you can configure

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

@@ -148,8 +148,6 @@ different Kubernetes components.
 | `ServiceNodeExclusion` | `true` | Beta | 1.19 | |
 | `ServiceTopology` | `false` | Alpha | 1.17 | |
 | `SetHostnameAsFQDN` | `false` | Alpha | 1.19 | |
-| `StartupProbe` | `false` | Alpha | 1.16 | 1.17 |
-| `StartupProbe` | `true` | Beta | 1.18 | |
 | `StorageVersionHash` | `false` | Alpha | 1.14 | 1.14 |
 | `StorageVersionHash` | `true` | Beta | 1.15 | |
 | `Sysctls` | `true` | Beta | 1.11 | |
@@ -277,6 +275,9 @@ different Kubernetes components.
 | `ServiceLoadBalancerFinalizer` | `false` | Alpha | 1.15 | 1.15 |
 | `ServiceLoadBalancerFinalizer` | `true` | Beta | 1.16 | 1.16 |
 | `ServiceLoadBalancerFinalizer` | `true` | GA | 1.17 | - |
+| `StartupProbe` | `false` | Alpha | 1.16 | 1.17 |
+| `StartupProbe` | `true` | Beta | 1.18 | 1.19 |
+| `StartupProbe` | `true` | GA | 1.20 | - |
 | `StorageObjectInUseProtection` | `true` | Beta | 1.10 | 1.10 |
 | `StorageObjectInUseProtection` | `true` | GA | 1.11 | - |
 | `StreamingProxyRedirects` | `false` | Beta | 1.5 | 1.5 |

content/en/docs/reference/command-line-tools-reference/kubelet.md

@@ -617,7 +617,6 @@ ServiceAppProtocol=true|false (BETA - default=true)<br/>
 ServiceNodeExclusion=true|false (BETA - default=true)<br/>
 ServiceTopology=true|false (ALPHA - default=false)<br/>
 SetHostnameAsFQDN=true|false (ALPHA - default=false)<br/>
-StartupProbe=true|false (BETA - default=true)<br/>
 StorageVersionHash=true|false (BETA - default=true)<br/>
 SupportNodePidsLimit=true|false (BETA - default=true)<br/>
 SupportPodPidsLimit=true|false (BETA - default=true)<br/>