C.139 - remove note about capping virtual functions

[WelliSolutions]

C.139 says

Note: Capping an individual virtual function with final is error-prone as final can easily be overlooked when defining/overriding a set of functions. Fortunately, the compiler catches such mistakes: You cannot re-declare/re-open a final member in a derived class.

I don't consider this as error-prone. Sure, it generates a compiler error, but that's not the common sense of error-prone.

If you consider this error-prone, let me make this statement as a counter-argument:

The definition of an int is error-prone as quotation marks can easily be overlooked when defining an int. Fortunately, the compiler catches such mistakes: you can't assign a string to it.

Proposal: simply remove the note. Using final on virtual methods works as in Java or C#. It's just normal to get a compiler error.