Added `rules_rust` to Recommended rules docs

closes https://github.com/bazelbuild/bazel/issues/15625

Closes #22458.

PiperOrigin-RevId: 635871380
Change-Id: I4acf02558f18e1b9db190113323e57f723ab3ced

site/en/rules/index.md

diff --git a/site/en/rules/index.md b/site/en/rules/index.md
index 8998251..b8d8def 100644
--- a/site/en/rules/index.md
+++ b/site/en/rules/index.md
@@ -28,6 +28,7 @@
 * [Package building](https://github.com/bazelbuild/rules_pkg){: .external}
 * [Protocol Buffers](https://github.com/bazelbuild/rules_proto#protobuf-rules-for-bazel){: .external}
 * [Python](https://github.com/bazelbuild/rules_python){: .external}
+* [Rust](https://github.com/bazelbuild/rules_rust){: .external}
 * [Scala](https://github.com/bazelbuild/rules_scala){: .external}
 * [Shell](/reference/be/shell)
 * [Webtesting](https://github.com/bazelbuild/rules_webtesting){: .external} (Webdriver)