Fixed #5282 - deprecated -name syntax

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Upstream-commit: a75758fcf648ed22fe979cbb625c209a92c5d873
Component: engine

components/engine/docs/sources/use/port_redirection.md

@@ -74,7 +74,7 @@ port on the host machine bound to a given container port. It is useful
 when using dynamically allocated ports:
 
     # Bind to a dynamically allocated port
-    docker run -p 127.0.0.1::8080 -name dyn-bound <image> <cmd>
+    docker run -p 127.0.0.1::8080 --name dyn-bound <image> <cmd>
 
     # Lookup the actual port
     docker port dyn-bound 8080