Correct sorting example for Ordering in scaladoc

	Below code snippet,
    Sorting.quickSort(pairs)(Ordering.by[(String, Int, Int), Int](_._2)

    should be
    Sorting.quickSort(pairs)(Ordering.by[(String, Int, Int), Int](_._2))
Merge pull request #2303 from starblood/gyuhang/libdoc

Correct sorting example for Ordering in scaladoc
Backport #2289's TermNames.unexpandedName as TermNames.originalName

Because this implementation is more clear than 2.10.x's and it will
simplify a further commit to fix SI-6715.
SI-6715 Shouldn't return "" from TermNames.originalName