message: Fix typo in faq.md
diff: @@ -257,4 +257,4 @@ Some issues we've seen historically which can cause crates to get rebuilt are:
  If after trying to debug your issue, however, you're still running into problems
  then feel free to [open an
  -issue](https://github.com/rust-lang/cargo/issuses/new)!
  +issue](https://github.com/rust-lang/cargo/issues/new)!
  