fix typo documenation

src/doc/rustdoc/src/references.md

@@ -22,7 +22,7 @@ If you know of other great resources, please submit a pull request!
 [API Guidelines]: https://rust-lang.github.io/api-guidelines/documentation.html
 [Github tagged RFCs]: https://github.com/rust-lang/rfcs/issues?q=label%3AT-rustdoc
 [Github tagged issues]: https://github.com/rust-lang/rust/issues?q=is%3Aissue+is%3Aopen+label%3AT-rustdoc
-[Guide on how to write documenation for a Rust crate]: https://blog.guillaume-gomez.fr/articles/2020-03-12+Guide+on+how+to+write+documentation+for+a+Rust+crate
+[Guide on how to write documentation for a Rust crate]: https://blog.guillaume-gomez.fr/articles/2020-03-12+Guide+on+how+to+write+documentation+for+a+Rust+crate
 [Learn Rust]: https://doc.rust-lang.org/book/ch14-02-publishing-to-crates-io.html#making-useful-documentation-comments
 [RFC 1574: More API Documentation Conventions]: https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html
 [RFC 1946: Intra Rustdoc Links]: https://rust-lang.github.io/rfcs/1946-intra-rustdoc-links.html