allow quick-edit (#2527)

Author: tshepang

book/book.toml

@@ -2,3 +2,7 @@
 title = "The `bindgen` User Guide"
 author = "The Servo project developers"
 description = "`bindgen` automatically generates Rust FFI bindings to C and C++ libraries."
+
+[output.html]
+git-repository-url = "https://github.com/rust-lang/rust-bindgen"
+edit-url-template = "https://github.com/rust-lang/rust-bindgen/edit/main/book/{path}"