Fix typo in rust_proto documentation (#2099)

There's a very minor typo in the Prost setup section of the `rust_proto`
documentation:
<img width="1008" alt="image"
src="https://github.com/bazelbuild/rules_rust/assets/1649989/9f0bbfa7-45f2-4b34-af7a-5f2315032502">

---------

Co-authored-by: UebelAndre <github@uebelandre.com>
diff --git a/docs/rust_proto.vm b/docs/rust_proto.vm
index 0ec3117..efb7572 100644
--- a/docs/rust_proto.vm
+++ b/docs/rust_proto.vm
@@ -18,7 +18,7 @@
 ```python
 load("@rules_rust//proto/prost:repositories.bzl", "rust_prost_dependencies")
 
-rust_proto_protobuf_dependencies()
+rust_prost_dependencies()
 
 load("@rules_rust//proto/prost:transitive_repositories.bzl", "rust_prost_transitive_repositories")