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Add information about clearing ROI
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docs/guide/copter/guided_mode.rst

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@@ -303,9 +303,10 @@ Send the `MAV_CMD_DO_SET_ROI <http://copter.ardupilot.com/common-mavlink-mission
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vehicle.send_mavlink(msg)
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vehicle.flush()
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The ROI is "reset" when the mode or the method used to control movement is changed. If you've set a yaw or region-of-interest value then this will be set to the default (vehicle faces the direction of travel).
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From Copter 3.2.1 you can explicitly reset the ROI by sending the `MAV_CMD_DO_SET_ROI <http://copter.ardupilot.com/common-mavlink-mission-command-messages-mav_cmd/#mav_cmd_do_set_roi>`_ command with zero in all values. The vehicle will then face the direction of travel.
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The ROI (and yaw) is also reset when the mode, or the command used to control movement, is changed.
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.. _guided_mode_copter_set_home:
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