docs: update Rust toolchain instructions (#6062)

situ2001 · lukastaegert · web-flow · commit 2e33ab945474 · 2025-08-17T09:20:54.000+02:00
Co-authored-by: Lukas Taegert-Atkinson &lt;lukastaegert@users.noreply.github.com&gt;
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -20,7 +20,15 @@ Working on your first Pull Request? You can learn how from this _free_ course, [
 
 Rollup now includes some Rust code. To compile it, you need to set up the Rust toolchain. If you haven't installed it yet, please see https://www.rust-lang.org/tools/install to learn how to download Rustup and install Rust.
 
-Make sure you use the same toolchain version as specified in the `/rust/rust-toolchain.toml` file. You should be able to install it with the following commands:
+Make sure you use the same toolchain version as specified in the `/rust/rust-toolchain.toml` file. For example, if the file contains the following:
+
+```toml
+[toolchain]
+profile = "default"
+channel = "nightly-2025-07-25"
+```
+
+You should be able to install it with the following commands:
 
 ```shell
 rustup toolchain install nightly-2025-07-25
