Change address to syslog-address in syslog docs

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

docs/sources/reference/run.md

@@ -882,17 +882,17 @@ command is not available for this logging driver
 
 The following logging options are supported for this logging driver:
 
-    --log-opt address=[tcp|udp]://host:port
-    --log-opt address=unix://path
+    --log-opt syslog-address=[tcp|udp]://host:port
+    --log-opt syslog-address=unix://path
     --log-opt syslog-tag="mailer"
 
-`address` specifies the remote syslog server address where the driver connects to.
+`syslog-address` specifies the remote syslog server address where the driver connects to.
 If not specified it defaults to the local unix socket of the running system.
 If transport is either `tcp` or `udp` and `port` is not specified it defaults to `514`
 The following example shows how to have the `syslog` driver connect to a `syslog`
 remote server at `192.168.0.42` on port `123`
 
-    $ docker run --log-driver=syslog --log-opt address=tcp://192.168.0.42:123
+    $ docker run --log-driver=syslog --log-opt syslog-address=tcp://192.168.0.42:123
 
 `syslog-tag` specifies tag for syslog messages from container.