Delete commutator tutorial (#44)

It's been ported to gui-docs where it will also contain info about commutating onix in the GUI.

Author: cjsha

source/Tutorials/Commutator.rst

@@ -12,7 +12,6 @@ Tutorials
 
     Troubleshooting-noise
     Measuring-latency
-    Commutator
     Multiple-boards
     Ephys-with-behavioural-camera
     bonsai-acquisition

source/Tutorials/index.rst

@@ -96,7 +96,7 @@ This section provides the basic steps needed in the Open Ephys GUI to get starte
    - A `Record Node <https://open-ephys.github.io/gui-docs/User-Manual/Plugins/Record-Node.html>`_
 
    - (optional) An `OE Commutator processor <https://open-ephys.github.io/gui-docs/User-Manual/Plugins/Commutator-Control.html>`_
-     (downloaded using the Plugin Installer) to use the Open Ephys torque-free SPI Commutator
+     (downloaded using the Plugin Installer) to use the Open Ephys torque-free SPI Commutator. For more info on this, visit the `Commutator Tutorial <https://open-ephys.github.io/gui-docs/Tutorials/Commutator.html?acquisition-hardware=acquisition-board>`_ in the Open Ephys GUI docs.
 
 3. Click the Play button to start data acquisition. Click Record to record.
 
@@ -107,4 +107,4 @@ This section provides the basic steps needed in the Open Ephys GUI to get starte
 Powering off the system
 -------------------------------------------
 
-The Acquisition Board does not have an on/off button. When you are done with acquisition, close the software and unplug the board from USB and power.
+The Acquisition Board does not have an on/off button. When you are done with acquisition, close the software and unplug the board from USB and power.