Bootstraped value_set type

It would be much cleaner not to list the returned values, as you don't really _know_ that these are returned, you simply return the value, the call to the set object returns.

What I want you to do: Use `@see` (see [here](http://www.stack.nl/~dimitri/doxygen/manual/commands.html#cmdsee)) and build the documentation to check if it worked. Can you do that?