Add a note about generate_workspace's deprecated state and redirect users to rules_jvm_external instead

Ref: https://github.com/bazelbuild/rules_jvm_external/issues/77

RELNOTES: None.
PiperOrigin-RevId: 244871265
diff --git a/site/docs/generate-workspace.md b/site/docs/generate-workspace.md
index cdd23c3..b5e81bf 100644
--- a/site/docs/generate-workspace.md
+++ b/site/docs/generate-workspace.md
@@ -3,6 +3,11 @@
 title: Generate external dependencies for a Java project
 ---
 
+> NOTE: `generate_workspace` is no longer maintained by the Bazel team. The
+GitHub project has been archived. Instead, please use [`rules_jvm_external`](
+https://github.com/bazelbuild/rules_jvm_external] to fetch and resolve
+Maven artifacts transitively.
+
 # Generate external dependencies from Maven projects
 
 The tool `generate_workspace` helps automate the process of writing