Removed outdated tutorial link

samples/python2/_tutorials_url.txt

-OpenCV-Python Tutorials
-http://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_tutorials.html

samples/python2/calibrate.py

@@ -11,9 +11,6 @@ default values:
     --debug:    ./output/
     --square_size: 1.0
     <image mask> defaults to ../data/left*.jpg
-
-read more:
-    http://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_calib3d/py_calibration/py_calibration.html
 '''
 
 # Python 2/3 compatibility

samples/python2/facedetect.py

@@ -5,9 +5,6 @@ face detection using haar cascades
 
 USAGE:
     facedetect.py [--cascade <cascade_fn>] [--nested-cascade <cascade_fn>] [<video_source>]
-
-read more:
-    http://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_objdetect/py_face_detection/py_face_detection.html
 '''
 
 # Python 2/3 compatibility

samples/python2/houghcircles.py

@@ -6,9 +6,6 @@ This example illustrates how to use cv2.HoughCircles() function.
 Usage:
     houghcircles.py [<image_name>]
     image argument defaults to ../data/board.jpg
-
-read more:
-    http://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_imgproc/py_houghcircles/py_houghcircles.html
 '''
 
 # Python 2/3 compatibility

samples/python2/houghlines.py

@@ -6,9 +6,6 @@ This example illustrates how to use Hough Transform to find lines
 Usage:
     houghlines.py [<image_name>]
     image argument defaults to ../data/pic1.png
-
-read more:
-    http://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_imgproc/py_houghlines/py_houghlines.html
 '''
 
 # Python 2/3 compatibility