Update README.md

Author: pmp-p

README.md

@@ -92,7 +92,7 @@ Useful .gitignore additions:
 - [List of available wheels](/wiki/pkg/)
 - [requesting modules](https://github.com/pygame-web/pkg-porting-wasm/issues)
 
-When importing non-stdlib packages (for example, numpy or matplotlib), you must put their import statements at top of `main.py`. You should also add a metadata header as specified by [PEP 723](https://peps.python.org/pep-0723/), for example:
+When importing **non-stdlib** packages (for example, numpy or matplotlib), you must put their import statements at top of `main.py`. You should also add a metadata header as specified by [PEP 723](https://peps.python.org/pep-0723/), for example:
 ```
 # /// script
 # dependencies = [