rustdoc doesn't display values for inlined constants

[tomjakubowski]

For example, given foo.rs:

pub const MAGIC: u32 = 0xDEADBEEF;

And bar.rs:

extern crate foo;

pub use MAGIC = foo::MAGIC;

The generated rustdocs for bar.rs show something like:

Constants

pub const MAGIC: u32 =

[tomjakubowski]

Updated to reflect the static -> const split.