message: Fix link to Zulip page
diff: @@ -6,7 +6,7 @@ This section documents meta processes by the Libs team.
  The libs team hangs out primarily in [the rust-lang Zulip](https://rust-lang.zulipchat.com/) these days in the `#t-libs` stream.
  -You can also find out more details about [Zulip and how the Rust community uses it](../../chat/zulip.html).
  +You can also find out more details about [Zulip and how the Rust community uses it](../../platforms/zulip.html).
  ## Useful GitHub queries
  