Add example command to create /etc/apt/keyrings directory (#43626)

* create folder for key

The following command will fail without the folder created manually beforhand.
```
curl -fsSL https://dl.k8s.io/apt/doc/apt-key.gpg | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-archive-keyring.gpg
```

* updated instruction

updated according to the comment in the PR

* updated mkdir part

* Updated mkdir

Author: karistom

content/en/docs/setup/production-environment/tools/kubeadm/install-kubeadm.md

@@ -182,8 +182,14 @@ These instructions are for Kubernetes {{< skew currentVersion >}}.
    The same signing key is used for all repositories so you can disregard the version in the URL:
 
    ```shell
+   # If the folder `/etc/apt/keyrings` does not exist, it should be created before the curl command, read the note below.
+   # sudo mkdir -p -m 755 /etc/apt/keyrings
    curl -fsSL https://pkgs.k8s.io/core:/stable:/{{< param "version" >}}/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
    ```
+   
+{{< note >}}
+In releases older than Debian 12 and Ubuntu 22.04, folder `/etc/apt/keyrings` does not exist by default, and it should be created before the curl command.
+{{< /note >}}
 
 {{< note >}}
 In releases older than Debian 12 and Ubuntu 22.04, `/etc/apt/keyrings` does not exist by default;

content/en/docs/tasks/tools/install-kubectl-linux.md

@@ -136,8 +136,14 @@ The following methods exist for installing kubectl on Linux:
 2. Download the public signing key for the Kubernetes package repositories. The same signing key is used for all repositories so you can disregard the version in the URL:
 
    ```shell
+   # If the folder `/etc/apt/keyrings` does not exist, it should be created before the curl command, read the note below.
+   # sudo mkdir -p -m 755 /etc/apt/keyrings
    curl -fsSL https://pkgs.k8s.io/core:/stable:/{{< param "version" >}}/deb/Release.key | sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
    ```
+   
+{{< note >}}
+In releases older than Debian 12 and Ubuntu 22.04, folder `/etc/apt/keyrings` does not exist by default, and it should be created before the curl command.
+{{< /note >}}
 
 3. Add the appropriate Kubernetes `apt` repository. If you want to use Kubernetes version different than {{< param "version" >}},
    replace {{< param "version" >}} with the desired minor version in the command below:
@@ -158,10 +164,6 @@ To upgrade kubectl to another minor release, you'll need to bump the version in
    sudo apt-get install -y kubectl
    ```
 
-{{< note >}}
-In releases older than Debian 12 and Ubuntu 22.04, `/etc/apt/keyrings` does not exist by default, and can be created using `sudo mkdir -m 755 /etc/apt/keyrings`
-{{< /note >}}
-
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 {{% tab name="Red Hat-based distributions" %}}