typo fix

modules/calib3d/include/opencv2/calib3d.hpp

@@ -763,7 +763,7 @@ and a rotation matrix.
 It optionally returns three rotation matrices, one for each axis, and the three Euler angles in
 degrees (as the return value) that could be used in OpenGL. Note, there is always more than one
 sequence of rotations about the three principal axes that results in the same orientation of an
-object, e.g. see @cite Slabaugh . Returned tree rotation matrices and corresponding three Euler angles
+object, e.g. see @cite Slabaugh . Returned three rotation matrices and corresponding three Euler angles
 are only one of the possible solutions.
  */
 CV_EXPORTS_W Vec3d RQDecomp3x3( InputArray src, OutputArray mtxR, OutputArray mtxQ,
@@ -789,7 +789,7 @@ matrix and the position of a camera.
 It optionally returns three rotation matrices, one for each axis, and three Euler angles that could
 be used in OpenGL. Note, there is always more than one sequence of rotations about the three
 principal axes that results in the same orientation of an object, e.g. see @cite Slabaugh . Returned
-tree rotation matrices and corresponding three Euler angles are only one of the possible solutions.
+three rotation matrices and corresponding three Euler angles are only one of the possible solutions.
 
 The function is based on #RQDecomp3x3 .
  */