Update scala-for-java-programmers

[max-k7v]

As I understood, for current example truth table looks like (sure if == defined correctly):

this/that  <  <= >  >=
1/2        t  t  f  f
2/2        f  t  f* t*
3/2        f  f  t  t

where t - true,
      f - false
      * - incorrect value

[ashawley]

I'm not seeing anything wrong with the current implementation of Ord trait on that page:

https://docs.scala-lang.org/tutorials/scala-for-java-programmers.html#traits

2 > 2 should be false, and 2 >= 2 should be true.

[Philippus]

I agree, the current implementation is correct.