Merge pull request #31309 from neolit123/1.24-update-kubeadm-docs-for-dockershim

kubeadm: adapt docs for 1.24 and dockershim removal

content/en/docs/reference/setup-tools/kubeadm/implementation-details.md

@@ -81,13 +81,8 @@ The user can skip specific preflight checks or all of them with the `--ignore-pr
 - Kubernetes system requirements:
   - if running on linux:
     - [error] if Kernel is older than the minimum required version
-    - [error] if required cgroups subsystem aren't in set up
-  - if using docker:
-    - [warning/error] if Docker service does not exist, if it is disabled, if it is not active.
-    - [error] if Docker endpoint does not exist or does not work
-    - [warning] if docker version is not in the list of validated docker versions
-  - If using other cri engine:
-    - [error] if crictl socket does not answer
+    - [error] if required cgroups subsystem aren't set up
+- [error] if the CRI endpoint does not answer
 - [error] if user is not root
 - [error] if the machine hostname is not a valid DNS subdomain
 - [warning] if the host name cannot be reached via network lookup
@@ -434,8 +429,7 @@ cluster startup problems.
 Please note that:
 
 1. `kubeadm join` preflight checks are basically a subset `kubeadm init` preflight checks
-1. Starting from 1.9, kubeadm provides better support for CRI-generic functionality; in that case, docker specific controls
-   are skipped or replaced by similar controls for crictl.
+1. Starting from 1.24, kubeadm uses crictl to communicate to all known CRI endpoints.
 1. Starting from 1.9, kubeadm provides support for joining nodes running on Windows; in that case, linux specific controls are skipped.
 1. In any case the user can skip specific preflight checks (or eventually all preflight checks) with the `--ignore-preflight-errors` option.