docs for bazel_skylib_gazelle_plugin via bzlmod

[jmhodges]

The release docs for bazel_skylib_gazelle_plugin only show how to add it as a dependency to your MODULE.bazel file, but there is more work necessary to integrate the plugin into a gazelle run.

It seems to also need something like this change to update a gazelle target to include it?

-load("@gazelle//:def.bzl", "gazelle")
+load("@gazelle//:def.bzl", "gazelle", "gazelle_binary")
 
+gazelle_binary(
+    name = "gazelle_bin",
+    languages = [
+        "@gazelle//language/bazel/visibility",
+        "@gazelle//language/proto",
+        "@gazelle//language/go",
+        "@bazel_skylib_gazelle_plugin//bzl:bzl",
+    ],
+)
+
 gazelle(
     name = "gazelle",
+    gazelle = ":gazelle_bin",
     prefix = "founding",
 )

But perhaps there's a better way to do it? I'm not sure.