[rust] fix axum example metadata (#1326)

### Description

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### Demo URL

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### Type of Change

- [ ] New Example
- [ ] Example updates (Bug fixes, new features, etc.)
- [ ] Other (changes to the codebase, but not to examples)

### New Example Checklist

- [ ] 🛫 `npm run new-example` was used to create the example
- [ ] 📚 The template wasn't used but I carefuly read the [Adding a new
example](https://github.com/vercel/examples#adding-a-new-example) steps
and implemented them in the example
- [ ] 📱 Is it responsive? Are mobile and tablets considered?

Author: ecklf

rust/axum/README.md

@@ -1,5 +1,5 @@
 ---
-name: Rust Axum Web Framework
+name: Rust Axum
 slug: rust-axum
 description: A Rust web application using the Axum framework with streaming capabilities on Vercel.
 framework: