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Fix incorrect parameter tip

**What this PR does / why we need it**:
run kubelet set --init-config-dir=xxx, kubelet not work. see the error log need to open KubeletConfigFile feature gates.
But 
kubelet --help 
      --init-config-dir string                                   The Kubelet will look in this directory for the init configuration. The path may be absolute or relative; relative paths start at the Kubelet's current working directory. Omit this argument to use the built-in default configuration values. Presently, you must also enable the `DynamicKubeletConfig` feature gate to pass this flag.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes ##55666

**Special notes for your reviewer**:

**Release note**:

```
NONE
```