message: Fix document url for libcurl format
diff: @@ -1075,7 +1075,7 @@ Sets the width for progress bar.
  [toml]: https://toml.io/
  [incremental compilation]: profiles.md#incremental
  [program path with args]: #executable-paths-with-arguments
  -[libcurl format]: https://ec.haxx.se/usingcurl-proxies.html
  +[libcurl format]: https://everything.curl.dev/libcurl/proxies#proxy-types
  [source replacement]: source-replacement.md
  [revision]: https://git-scm.com/docs/gitrevisions
  [registries]: registries.md
  