Track path changes due to nushell#8815

crates/nu-std/CONTRIBUTING.md

@@ -52,6 +52,8 @@ Make your change in a local clone of that repo and submit a PR to the release no
 ## Developing
 (All paths below shown relative to the root folder of the git repository containing the standard library.)
 ### Setup
+To work on the standard library, you don't necessarily need to compile or debug the interpreter itself, so you might not need to install the Rust toolchain. But if you want to do that, see [nushell CONTRIBUTING.md](https://github.com/nushell/nushell/blob/main/CONTRIBUTING.md).
+
 
 0. Install the Rust toolchain and Nushell build tools.  See [nushell CONTRIBUTING](https://github.com/nushell/nushell/blob/main/CONTRIBUTING.md) for details.
 The standard library is tightly coupled to a particular version of Nushell interpreter,