Merge pull request #29663 from Prasoon-Bodke:fix/houghlinesp-doc-shape-5.0

samples: fix HoughLines/HoughLinesP Python sample for 5.0 shape change (fixes #29637) - #29663

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Fixes #29637.

OpenCV 5.0 changed vector-backed Mat/OutputArray to true 1D arrays (see 
migration guide: 1D and 0D array semantics). This changes HoughLines/
HoughLinesP Python return shape from (N,1,X) to (N,X), breaking the old 
indexing pattern used in the tutorial sample.

Tested locally against opencv-python 5.0 — script runs without error, 
lines drawn correctly on samples/data/sudoku.png.

samples/python/tutorial_code/ImgTrans/HoughLine/hough_lines.py

@@ -39,9 +39,7 @@ def main(argv):
     ## [draw_lines]
     # Draw the lines
     if lines is not None:
-        for i in range(0, len(lines)):
-            rho = lines[i][0][0]
-            theta = lines[i][0][1]
+        for rho, theta in lines.reshape(-1, 2):
             a = math.cos(theta)
             b = math.sin(theta)
             x0 = a * rho
@@ -59,8 +57,9 @@ def main(argv):
     ## [draw_lines_p]
     # Draw the lines
     if linesP is not None:
-        for i in range(0, len(linesP)):
-            l = linesP[i][0]
+        num_lines, _ = linesP.shape
+        for i in range(num_lines):
+            l = linesP[i]
             cv.line(cdstP, (l[0], l[1]), (l[2], l[3]), (0,0,255), 3, cv.LINE_AA)
     ## [draw_lines_p]
     ## [imshow]
@@ -76,4 +75,4 @@ def main(argv):
     ## [exit]
 
 if __name__ == "__main__":
-    main(sys.argv[1:])
+    main(sys.argv[1:])