Fix broken link in error-message

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/daemon_unix.go

@@ -279,7 +279,7 @@ func configureSysInit(config *Config) (string, error) {
 	localCopy := filepath.Join(config.Root, "init", fmt.Sprintf("dockerinit-%s", dockerversion.VERSION))
 	sysInitPath := utils.DockerInitPath(localCopy)
 	if sysInitPath == "" {
-		return "", fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See https://docs.docker.com/contributing/devenvironment for official build instructions.")
+		return "", fmt.Errorf("Could not locate dockerinit: This usually means docker was built incorrectly. See https://docs.docker.com/project/set-up-dev-env/ for official build instructions.")
 	}
 
 	if sysInitPath != localCopy {