rustdoc: Change the output of "Interface" to "Trait"

[kud1ing]

rustdoc still refers to traits as "Interface"s.

Example:

• tuple.rs defines a trait CopyableTuple
• On http://static.rust-lang.org/doc/core/tuple.html this shows up as "Interface CopyableTuple".

[catamorphism]

Fixed in d91b2d4 -- thanks for the report!

[kud1ing]

Thanks for the quick fix