Update Documentation.md
Update Documentation.md

Added an example of increasing the number of tests and changing the size range of the test cases.
yukitos/FsCheck,forki/FsCheck,forki/FsCheck,cloudRoutine/FsCheck,ploeh/FsCheck,yukitos/FsCheck,sideeffffect/FsCheck,cloudRoutine/FsCheck,fsharp/FsCheck,paulyoung/FsCheck,ErikSchierboom/FsCheck,jhamm/FsCheck,fscheck/FsCheck,fscheck/FsCheck,yukitos/FsCheck,paulyoung/FsCheck