Tuple-struct signature in generated docs is misordered.

[frewsxcv]

In the source:

pub struct GeometryCollection<T>(pub Vec<Geometry<T>>) where T: Float;

In the generated documentation:

pub struct GeometryCollection<T> where T: Float(pub Vec<Geometry<T>>);

[Aatch]

This is because for record structs, the syntax is struct Foo<T> where T: Bar { /***/ }, so tuple structs will need some special-casing here.