Fix description for services.kubernetes.addonManager.enable (#71448)

`mkEnableOption` already prefixes the description with
"Whether to enable"

Changed files
+1 -1
nixos
modules
services
cluster
kubernetes
+1 -1
nixos/modules/services/cluster/kubernetes/addon-manager.nix
···
'';
};
-
enable = mkEnableOption "Whether to enable Kubernetes addon manager.";
+
enable = mkEnableOption "Kubernetes addon manager.";
};
###### implementation