Install curl; nix stray backslash; use proper IP address

Upstream-commit: 3a9ef5f9bbae19ae5ac4108dbbaed649e26d942e
Component: engine

components/engine/docs/sources/examples/python_web_app.rst

@@ -70,7 +70,8 @@ lookup the public-facing port which is NAT-ed store the private port used by the
 
 .. code-block:: bash
 
-    curl \http://`hostname`:$WEB_PORT
+    sudo aptitude install curl
+    curl http://127.0.0.1:$WEB_PORT
       Hello world!
 
 access the web app using curl. If everything worked as planned you should see the line "Hello world!" inside of your console.