Grammatical errors for help() in detect_mser.cpp (#14122)
* Grammatical errors for help() statement
Corrected spelling of "synthetic" and added grammatical clarification for keys to press to change view or use mouse.
* Adjustment of superfluous spaces
Mser sample improvments (#12032)
* Fixed bug in detect_mser sample
Wrong number of colors used to generate the synthetic images
* Formatting improvements
* Using safer casts
* Improved readability of legend generation
* Various readability fixes in detect_mser sample
All of these: (performance) Prefer prefix ++/-- operators for non-primitive types.
[modules/calib3d/src/fundam.cpp:1049] -> [modules/calib3d/src/fundam.cpp:1049]: (style) Same expression on both sides of '&&'.