Add a no_link example

Author: ehuss

src/items/extern-crates.md

@@ -79,6 +79,15 @@ r[items.extern-crate.no_link]
 r[items.extern-crate.no_link.intro]
 The *`no_link` [attribute][attributes]* may be specified on an `extern crate` item to prevent linking the crate into the output. This is commonly used to load a crate to access only its macros.
 
+> [!EXAMPLE]
+> <!-- ignore: requires external crates -->
+> ```rust,ignore
+> #[no_link]
+> extern crate other_crate;
+>
+> other_crate::some_macro!();
+> ```
+
 [identifier]: ../identifiers.md
 [RFC 940]: https://github.com/rust-lang/rfcs/blob/master/text/0940-hyphens-considered-harmful.md
 [`macro_use` attribute]: ../macros-by-example.md#the-macro_use-attribute