doc/guide/dependencies: Add a 'rust' language marker
doc/guide/dependencies: Add a 'rust' language marker

This had been added to the non-book docs in 2ad45a56 ([doc] Sync back
doc/book changes into old docs, 2017-08-31, #4455), despite the fact
that the book didn't actually have that marker:

  $ git cat-file -p 2ad45a56:src/doc/book/src/guide/dependencies.md | grep -A2 'You can now use the'
  You can now use the `regex` library using `extern crate` in `main.rs`.

  ```

tshepang/cargo,rust-lang/cargo,vojtechkral/cargo,nipunn1313/cargo,nipunn1313/cargo,rustyhorde/cargo,tsurai/cargo,tshepang/cargo,tshepang/cargo,nipunn1313/cargo,nipunn1313/cargo,rustyhorde/cargo,rust-lang/cargo,rustyhorde/cargo,eminence/cargo,tsurai/cargo,rust-lang/cargo,vojtechkral/cargo,tsurai/cargo,eminence/cargo,rustyhorde/cargo,eminence/cargo,vojtechkral/cargo,tshepang/cargo,rust-lang/cargo,eminence/cargo,tsurai/cargo,tsurai/cargo,vojtechkral/cargo