Auto merge of #59575 - Centril:rollup, r=Centril

Rollup of 3 pull requests

Successful merges:

 - #59405 (doc: use correct body font URLs)
 - #59562 (Changed reference style in dbg macro docs.)
 - #59569 (Add book.toml with title to unstable-book doc)

Failed merges:

r? @ghost

Author: bors

src/doc/rust.css

@@ -14,19 +14,19 @@
 	font-family: 'Source Serif Pro';
 	font-style: normal;
 	font-weight: 400;
-	src: local('Source Serif Pro'), url("SourceSerifPro-Regular.woff") format('woff');
+	src: local('Source Serif Pro'), url("SourceSerifPro-Regular.ttf.woff") format('woff');
 }
 @font-face {
 	font-family: 'Source Serif Pro';
 	font-style: italic;
 	font-weight: 400;
-	src: url("Heuristica-Italic.woff") format('woff');
+	src: url("SourceSerifPro-It.ttf.woff") format('woff');
 }
 @font-face {
 	font-family: 'Source Serif Pro';
 	font-style: normal;
 	font-weight: 700;
-	src: local('Source Serif Pro Bold'), url("SourceSerifPro-Bold.woff") format('woff');
+	src: local('Source Serif Pro Bold'), url("SourceSerifPro-Bold.ttf.woff") format('woff');
 }
 @font-face {
 	font-family: 'Source Code Pro';

src/doc/unstable-book/book.toml

@@ -0,0 +1,2 @@
+[book]
+title = "The Rust Unstable Book"

src/libstd/macros.rs

@@ -240,7 +240,7 @@ macro_rules! eprintln {
 /// Note that the macro is intended as a debugging tool and therefore you
 /// should avoid having uses of it in version control for longer periods.
 /// Use cases involving debug output that should be added to version control
-/// are better served by macros such as [`debug!`][debug-log] from the [`log`][log] crate.
+/// are better served by macros such as [`debug!`] from the [`log`] crate.
 ///
 /// # Stability
 ///
@@ -315,8 +315,8 @@ macro_rules! eprintln {
 /// file and line whenever it's reached.
 ///
 /// [stderr]: https://en.wikipedia.org/wiki/Standard_streams#Standard_error_(stderr)
-/// [debug-log]: https://docs.rs/log/*/log/macro.debug.html
-/// [log]: https://docs.rs/log/
+/// [`debug!`]: https://docs.rs/log/*/log/macro.debug.html
+/// [`log`]: https://crates.io/crates/log
 #[macro_export]
 #[stable(feature = "dbg_macro", since = "1.32.0")]
 macro_rules! dbg {