tweak wording to prevent confusion between Cargo.toml and .cargo/config.toml

Author: jakobhellermann

README.md

@@ -12,7 +12,7 @@ cargo install wasm-server-runner
 
 ### Step 2.
 
-Add this to your `~/.cargo/config.toml`:
+Add this to your `~/.cargo/config.toml` (**not** the `Cargo.toml` of your project!):
 
 ```toml
 [target.wasm32-unknown-unknown]
@@ -35,4 +35,4 @@ INFO wasm_server_runner: wasm output is 49.79kb large
 INFO wasm_server_runner::server: starting webserver at http://127.0.0.1:1334
 ```
 
-The website will reload when the server is restarted and serve files relative to the current directory.
+The website will reload when the server is restarted and serve files relative to the current directory.