Fix a link about Rustdoc internals

Author: JohnTitor

src/rustdoc.md

@@ -4,9 +4,10 @@ Rustdoc actually uses the rustc internals directly. It lives in-tree with the
 compiler and standard library. This chapter is about how it works.
 For information about Rustdoc's features and how to use them, see
 the [Rustdoc book](https://doc.rust-lang.org/nightly/rustdoc/).
-For more details about how rustdoc works, see the ["Rustdoc internals" chapter].
+For more details about how rustdoc works, see the
+["Rustdoc internals" chapter][Rustdoc internals].
 
-["Rustdoc internals" chapter]: ./rustdoc-internals.md
+[Rustdoc internals]: ./rustdoc-internals.md
 
 Rustdoc is implemented entirely within the crate [`librustdoc`][rd]. It runs
 the compiler up to the point where we have an internal representation of a
@@ -47,7 +48,7 @@ does is call the `main()` that's in this crate's `lib.rs`, though.)
     bundle is meant to be used as though you would copy out the `doc` folder to
     a web server, since that's where the CSS/JS and landing page are.
 * Use `x.py test src/test/rustdoc*` to run the tests using a stage1 rustdoc.
-  * See [rustdoc internals] for more information about tests.
+  * See [Rustdoc internals] for more information about tests.
 * Most of the HTML printing code is in `html/format.rs` and `html/render.rs`.
   It's in a bunch of `fmt::Display` implementations and supplementary
   functions.