docs: fix image-cache-path flag description

Fix invalid description of flag, spotted during reviewing docs.

Signed-off-by: Mateusz Urbanek <mateusz.urbanek@siderolabs.com>

Author: shanduur

cmd/talosctl/cmd/talos/image.go

@@ -555,7 +555,7 @@ func init() {
 	imageCacheCreateCmd.PersistentFlags().BoolVar(&imageCacheCreateCmdFlags.force, "force", false, "force overwrite of existing image cache")
 
 	imageCmd.AddCommand(imageCacheServeCmd)
-	imageCacheServeCmd.PersistentFlags().StringVar(&imageCacheServeCmdFlags.imageCachePath, "image-cache-path", "", "directory to save the image cache in OCI format")
+	imageCacheServeCmd.PersistentFlags().StringVar(&imageCacheServeCmdFlags.imageCachePath, "image-cache-path", "", "directory to save the image cache in flat format")
 	imageCacheServeCmd.MarkPersistentFlagRequired("image-cache-path") //nolint:errcheck
 	imageCacheServeCmd.PersistentFlags().StringVar(&imageCacheServeCmdFlags.address, "address", constants.RegistrydListenAddress, "address to serve the registry on")
 	imageCacheServeCmd.PersistentFlags().StringVar(&imageCacheServeCmdFlags.tlsCertFile, "tls-cert-file", "", "TLS certificate file to use for serving")

website/content/v1.12/reference/cli.md

@@ -1959,7 +1959,7 @@ talosctl image cache-serve [flags]
 ```
       --address string            address to serve the registry on (default "127.0.0.1:3172")
   -h, --help                      help for cache-serve
-      --image-cache-path string   directory to save the image cache in OCI format
+      --image-cache-path string   directory to save the image cache in flat format
       --tls-cert-file string      TLS certificate file to use for serving
       --tls-key-file string       TLS key file to use for serving
 ```