Fix Python PortForwarder module (wpilibsuite#2623)

Author: auscompgeek

source/docs/networking/networking-utilities/portforwarding.rst

@@ -25,7 +25,7 @@ Often teams may wish to connect directly to the roboRIO for controlling their ro
 
    .. code-block:: python
 
-      wpiutil.PortForwarder.getInstance().add(8888, "wpilibpi.local", 80)
+      wpinet.PortForwarder.getInstance().add(8888, "wpilibpi.local", 80)
 
 .. important:: You **can not** use a port less than 1024 as your local forwarded port. It is also important to note that you **can not** use full URLs (``http://wpilibpi.local``) and should only use IP Addresses or DNS names.
 
@@ -51,4 +51,4 @@ To stop forwarding on a specified port, simply call ``remove(int port)`` with po
 
    .. code-block:: python
 
-      wpiutil.PortForwarder.getInstance().remove(8888)
+      wpinet.PortForwarder.getInstance().remove(8888)