Fix highlighting in Rust (#130)

Author: tothmano

guides/rust.mdx

@@ -29,7 +29,7 @@ If you use the [Axiom CLI](/reference/cli), run `eval $(axiom config export -f)`
 
 ## Use client
 
-```rust,no_run
+```rust
 use axiom_rs::Client;
 use serde_json::json;