corrected description of goodFeaturesToTrack (ticket #1488)

modules/imgproc/doc/feature_detection.rst

@@ -228,6 +228,10 @@ Determines strong corners on an image.
 
     :param image: Input 8-bit or floating-point 32-bit, single-channel image.
     
+    :param eigImage: The parameter is ignored.
+    
+    :param tempImage: The parameter is ignored.
+
     :param corners: Output vector of detected corners.
 
     :param maxCorners: Maximum number of corners to return. If there are more corners than are found, the strongest of them is returned.