package/docker-containerd: refer to official website

Containerd is no longer maintained under the docker github project and now
has an official website, so refer to that in the help text.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 638504bcdf98d44b09d7964ebaccb81137af1455)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/docker-containerd/Config.in

@@ -14,7 +14,7 @@ config BR2_PACKAGE_DOCKER_CONTAINERD
 	help
 	  containerd is a daemon to control runC.
 
-	  https://github.com/docker/containerd
+	  https://containerd.io/
 
 if BR2_PACKAGE_DOCKER_CONTAINERD