Fix typo in dockerd reference documentation

Signed-off-by: Graeme Wiebe <graeme.wiebe@gmail.com>
(cherry picked from commit e93ec2f6a6)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/reference/commandline/dockerd.md

@@ -205,7 +205,7 @@ find examples of using Systemd socket activation with Docker and Systemd in the
 You can configure the Docker daemon to listen to multiple sockets at the same
 time using multiple `-H` options:
 
-The example below runs the daemon listenin on the default unix socket, and
+The example below runs the daemon listening on the default unix socket, and
 on 2 specific IP addresses on this host:
 
 ```console