Removed a leading whitespace from a parenthetical comment and corrected the spelling of "maybe"

There is necessary to account also x-coordinate of the end of the edge when determining bounding box of the edge collection.

- Use cv::AutoBuffer rather than new allocation
- Fix "assignment operator could not be generated" warning

mask = cv2.inRange(hsv, lower_green, upper_green)
to
mask = cv2.inRange(hsv, lower_blue, upper_blue)

Rewrite the note on HoughCircles documentation to make it more clear

Add note to clarify that the output vector of found circles is sorted by
descending order of centres accumulator values.

Also delete reductant lines on the HoughCircles documentation.

Added comments to hough circles function.

Added comments to icvhoughgradient

Misalignment in line 1183 corrected

It could improve performance when image size is large.
E.g. OCL_PyrUpFixture_PyrUp.PyrUp/18