Merge pull request #30050 from sftim/20211011_fix_api_reference_kubeadm_link

replaced link from api-beta2 to api-beta3

Author: k8s-ci-robot

content/en/docs/reference/setup-tools/kubeadm/kubeadm-init.md

@@ -127,7 +127,7 @@ If your configuration is not using the latest version it is **recommended** that
 the [kubeadm config migrate](/docs/reference/setup-tools/kubeadm/kubeadm-config/) command.
 
 For more information on the fields and usage of the configuration you can navigate to our
-[API reference page](/docs/reference/config-api/kubeadm-config.v1beta2/).
+[API reference page](/docs/reference/config-api/kubeadm-config.v1beta3/).
 
 ### Adding kube-proxy parameters {#kube-proxy}