docs: Consistently use colcon_ws for workspace name in Sphinx docs SITL test page

Author: hmakelin

docs/pages/developer_guide/test/sitl_tests.rst

@@ -4,7 +4,7 @@ SITL tests are under the ``test/sitl`` folder. They are simple Python scripts:
 
 .. code-block:: bash
 
-    cd ~/px4_ros_com_ros2/src/gisnav/test/sitl
+    cd ~/colcon_ws/src/gisnav/test/sitl
     python sitl_test_mock_gps_node.py
 
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