Typo in docs

[fhupp]

On the Rustdoc internals page there is a half finished sentence in the first section.

• handling import globs and cycles, so there are no duplicates or infinite directory trees
• inlining public use exports of private items, or showing a “Reexport” line in the module page
• inlining items with #[doc(hidden)] if the base item is hidden but the
• showing #[macro_export]-ed macros at the crate root, regardless of whether they’re defined as a reexport or not