AP_VisualOdom: minor format and comment fixes

libraries/AP_VisualOdom/AP_VisualOdom.h

@@ -49,7 +49,6 @@ public:
         float confidence;           // confidence expressed as a value from 0 (no confidence) to 100 (very confident)
         uint32_t last_sensor_update_ms;    // system time (in milliseconds) of last update from sensor
         uint32_t last_processed_sensor_update_ms; // timestamp of last sensor update that was processed
-
     };
 
     // detect and initialise any sensors

libraries/AP_VisualOdom/AP_VisualOdom_MAV.cpp

@@ -25,7 +25,7 @@ AP_VisualOdom_MAV::AP_VisualOdom_MAV(AP_VisualOdom &frontend) :
 {
 }
 
-// consume VISIOIN_POSITION_DELTA MAVLink message
+// consume VISION_POSITION_DELTA MAVLink message
 void AP_VisualOdom_MAV::handle_msg(const mavlink_message_t &msg)
 {
     // decode message