etcd.conf.yml.sample: rename to "log-outputs"

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

etcd.conf.yml.sample

@@ -132,7 +132,7 @@ debug: false
 log-package-levels:
 
 # Specify 'stdout' or 'stderr' to skip journald logging even when running under systemd.
-log-output: [default]
+log-outputs: [default]
 
 # Force to create a new one member cluster.
 force-new-cluster: false