Merge pull request #784 from nealmcb/patch-1

For errors, gently suggest rustup check

Author: itowlson

docs/content/quickstart.md

@@ -195,6 +195,8 @@ Successfully ran the build command for the Spin components.
 >
 > For more details, see the [page about developing Spin applications](./developing.md).
 
+If you run into errors, you might want to use `rustup check` to see if your Rust installation is up-to-date.
+
 ## Running the application with `spin up`
 
 Now that we configured the application and built our component, we can _spin up_

docs/content/rust-components.md

@@ -281,8 +281,8 @@ be used when implementing the component.
 Sometimes things can go wrong, especially such early projects. If you bump into
 issues building and running your Rust component:
 
-- ensure `cargo` is present in your path — we recommend
-[Rust](https://www.rust-lang.org/) at [1.56+](https://www.rust-lang.org/tools/install)
+- ensure `cargo` is present in your path
+- ensure your [Rust](https://www.rust-lang.org/) version is recent, via `rustup check`
 - ensure `wasm32-wasi` target is configured for your Rust installation —
 you can add it by running `rustup target add wasm32-wasi`
 - build a `release` version of the component — all Spin application definitions