Smallest typo correction ever

Signed-off-by: Cyril Francesconi <cyrilf7x@gmail.com>

docs/sources/examples/nodejs_web_app.md

@@ -157,7 +157,7 @@ Print the output of your app:
 
 ## Test
 
-To test your app, get the the port of your app that Docker mapped:
+To test your app, get the port of your app that Docker mapped:
 
     $ sudo docker ps