docs: fix instructions to create mirror ca certificate

Co-authored-by: Dimitri Koshkin <[email protected]>
Signed-off-by: Shalin Patel <[email protected]>

Author: Shalin Patel

docs/content/customization/generic/image-registries.md

@@ -44,7 +44,7 @@ on the `KubeadmControlPlaneTemplate` and `KubeadmConfigTemplate`.
 
 To use a image registry as mirror with CA certificate, specify the following configuration:
 
-If your registry mirror requires self signed CA certifate, create a Kubernetes Secret with keys for `ca.crt`:
+If your registry mirror requires self signed CA certifate, create a Kubernetes Secret with its contents and key `ca.crt`:
 
 ```shell
 kubectl create secret generic my-mirror-ca-cert-secret \