Updated Documentation (HoughCircles)

Rewrite the note on HoughCircles documentation to make it more clear

Revert "Updated Documentation (HoughCircles)"

This reverts commit e7d618266abf61e8386fea66eb5b7cedd1ced44c.

Updated documentation

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.

Updated Documentation (HoughCircles)

Rewrite the note on HoughCircles documentation to make it more clear

Added comments to hough circles function.

Added comments to icvhoughgradient