Link to the Rustdoc book in the rustdoc chapter (#981)

This makes a) makes it easier to find info about rustdoc's features and b) redirects people in the wrong place to where they should be looking.
2020-12-04 12:23:46 -05:00 · 2020-12-04 12:23:46 -05:00 · 55c7be5d83
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 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/).

 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