clarify BoardSize.NumCellTypes and BoardSize.NumSpecialTypes

com.unity.ml-agents/Runtime/Integrations/Match3/AbstractBoard.cs

 
         /// <summary>
         /// Returns the "color" of the piece at the given row and column.
-        /// This should be between 0 and NumCellTypes-1 (inclusive).
+        /// This should be between 0 and BoardSize.NumCellTypes-1 (inclusive).
         /// The actual order of the values doesn't matter.
         /// </summary>
         /// <param name="row"></param>
 
         /// <summary>
         /// Returns the special type of the piece at the given row and column.
-        /// This should be between 0 and NumSpecialTypes (inclusive).
+        /// This should be between 0 and BoardSize.NumSpecialTypes (inclusive).
         /// The actual order of the values doesn't matter.
         /// </summary>
         /// <param name="row"></param>

com.unity.ml-agents/Runtime/Integrations/Match3/Match3SensorComponent.cs

                 return Array.Empty<ISensor>();
             }
             var cellSensor = Match3Sensor.CellTypeSensor(board, m_ObservationType, m_SensorName + " (cells)");
-            // This can be null if numSpecialTypes is 0
+            // This can be null if BoardSize.NumSpecialTypes is 0
             var specialSensor = Match3Sensor.SpecialTypeSensor(board, m_ObservationType, m_SensorName + " (special)");
             m_Sensors = specialSensor != null
                 ? new ISensor[] { cellSensor, specialSensor }

docs/Integrations-Match3.md

 
 ##### `public abstract int GetCellType(int row, int col)`
 Returns the "color" of piece at the given row and column.
-This should be between 0 and NumCellTypes-1 (inclusive).
+This should be between 0 and BoardSize.NumCellTypes-1 (inclusive).
-This should be between 0 and NumSpecialTypes (inclusive).
+This should be between 0 and BoardSize.NumSpecialTypes (inclusive).
 The actual order of the values doesn't matter.
 
 ##### `public abstract bool IsMoveValid(Move m)`