message: Add section to about page that points to how to build a crate's documentation locally.
diff: @@ -168,6 +168,9 @@ rustc-args = [ "--example-rustc-arg" ]
  # Additional `RUSTDOCFLAGS` to set (default: none)
  rustdoc-args = [ "--example-rustdoc-arg" ]</pre></code>
  + <h4>Test crate documentation build locally</h4>
  + <p>The <a href="https://github.com/rust-lang/docs.rs/blob/master/README.md#build-subcommand" target="_blank">docs.rs README</a> details how to build an unpublished crate's documentation locally using the same Docker image used by the build agent.</p>
  +
  <h4>Version</h4>
  <p>Currently running Docs.rs version is: <strong>{{cratesfyi_version}}</strong>
  