message: Fix small grammar error
diff: # Rust Forge
  Welcome to the Rust Forge! Rust Forge serves as a repository of supplementary
  documentation useful for members of [The Rust Programming Language]. If
  -you find any mistakes, typos, or want to add to the Rust Forge. Feel free to
  +you find any mistakes, typos, or want to add to the Rust Forge, feel free to
  file an issue or PR on the [Rust Forge GitHub].
  [The Rust Programming Language]: https://rust-lang.org
  