Proposing a PR to fix a few small typos

[timgates42]

Issue Type

[x] Bug (Typo)

Steps to Replicate and Expected Behaviour

• Examine source/py_tutorials/py_feature2d/py_sift_intro/py_sift_intro.rst, source/py_tutorials/py_photo/py_inpainting/py_inpainting.rst, source/py_tutorials/py_photo/py_non_local_means/py_non_local_means.rst and observe neigbourhood, however expect to see neighbourhood.
• Examine source/py_tutorials/py_imgproc/py_template_matching/py_template_matching.rst and observe occurances, however expect to see occurrences.
• Examine source/py_tutorials/py_ml/py_kmeans/py_kmeans_understanding/py_kmeans_understanding.rst and observe laballed, however expect to see labelled.
• Examine source/py_tutorials/py_imgproc/py_filtering/py_filtering.rst and observe imagess, however expect to see images.
• Examine source/py_tutorials/py_imgproc/py_morphological_ops/py_morphological_ops.rst and observe happends, however expect to see happens.
• Examine source/py_tutorials/py_imgproc/py_contours/py_contours_hierarchy/py_contours_hierarchy.rst and observe examle, however expect to see example.
• Examine source/py_tutorials/py_feature2d/py_sift_intro/py_sift_intro.rst and observe devided, however expect to see divided.
• Examine source/py_tutorials/py_imgproc/py_grabcut/py_grabcut.rst and observe depeding, however expect to see depending.
• Examine source/py_tutorials/py_feature2d/py_shi_tomasi/py_shi_tomasi.rst and observe conidered, however expect to see considered.
• Examine source/py_tutorials/py_video/py_bg_subtraction/py_bg_subtraction.rst and observe adaptibility, however expect to see adaptability.

Notes

Semi-automated issue generated by
https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md

To avoid wasting CI processing resources a branch with the fix has been
prepared but a pull request has not yet been created. A pull request fixing
the issue can be prepared from the link below, feel free to create it or
request @timgates42 create the PR. Alternatively if the fix is undesired please
close the issue with a small comment about the reasoning.

https://github.com/timgates42/OpenCV2-Python-Tutorials/pull/new/bugfix_typos

Thanks.