Auto merge of #39633 - steveklabnik:vendor-mdbook, r=alexcrichton

Port books to mdbook

Part of rust-lang/rust#39588

blocked on rust-lang/rust#39431

As a first step towards the bookshelf, we ~vendor mdbook in-tree and~ port our books to it. Eventually, both of these books will be moved out-of-tree, but the nightly book will rely on doing the same thing. As such, this intermediate step is useful.

r? @alexcrichton @brson

/cc @azerupi

Author: bors

src/lib.rs

@@ -189,8 +189,8 @@
 //! [`sync`]: sync/index.html
 //! [`thread`]: thread/index.html
 //! [`use std::env`]: env/index.html
-//! [`use`]: ../book/crates-and-modules.html#importing-modules-with-use
-//! [crate root]: ../book/crates-and-modules.html#basic-terminology-crates-and-modules
+//! [`use`]: ../book/crates-and-modules.html#Importing%20Modules%20with%20use
+//! [crate root]: ../book/crates-and-modules.html#Basic%20terminology%3A%20Crates%20and%20Modules
 //! [crates.io]: https://crates.io
 //! [deref coercions]: ../book/deref-coercions.html
 //! [files]: fs/struct.File.html

src/primitive_docs.rs

@@ -490,7 +490,7 @@ mod prim_str { }
 /// assert_eq!(tuple.2, 'c');
 /// ```
 ///
-/// For more about tuples, see [the book](../book/primitive-types.html#tuples).
+/// For more about tuples, see [the book](../book/primitive-types.html#Tuples).
 ///
 /// # Trait implementations
 ///