Update protoc docs

Author: alamb

datafusion/proto/REAME-dev.md renamed to datafusion/proto/README-dev.md

@@ -22,8 +22,11 @@
 The prost/tonic code can be generated by running `./regen.sh`, which in turn invokes the Rust binary located in [gen](./gen)
 
 This is necessary after modifying the protobuf definitions or altering the dependencies of [gen](./gen), and requires a
-valid installation of [protoc](https://github.com/protocolbuffers/protobuf#protocol-compiler-installation).
+valid installation of [protoc] (see [installation instructions] for details).
 
 ```bash
 ./regen.sh
 ```
+
+[protoc]: https://github.com/protocolbuffers/protobuf#protocol-compiler-installation
+[installation instructions]: https://arrow.apache.org/datafusion/contributor-guide/#protoc-installation