message: Fix typo in contrib docs.
diff: @@ -8,7 +8,7 @@ There are many ways to contribute, such as [helping other users], [filing
  issues], [improving the documentation], [fixing bugs], and working on [small]
  and [large features].
  -If you have a general question about Cargo or it's internals, feel free to ask
  +If you have a general question about Cargo or its internals, feel free to ask
  on [Zulip].
  This guide assumes you have some familiarity with Rust, and how to use Cargo,
  