Fix volume binding in fluentd container example

Signed-off-by: Konstantin L <sw.double@gmail.com>

docs/admin/logging/fluentd.md

@@ -107,7 +107,7 @@ aggregate store.
 
 2. Launch Fluentd container with this configuration file:
 
-        $ docker run -it -p 24224:24224 -v /path/to/conf/test.conf:/fluentd/etc -e FLUENTD_CONF=test.conf fluent/fluentd:latest
+        $ docker run -it -p 24224:24224 -v /path/to/conf/test.conf:/fluentd/etc/test.conf -e FLUENTD_CONF=test.conf fluent/fluentd:latest
 
 3. Start one or more containers with the `fluentd` logging driver: