docs: Update package-json.md (#6680)

Co-authored-by: Jordan Harband <ljharb@gmail.com>

Author: p-chan

docs/lib/content/configuring-npm/package-json.md

@@ -285,6 +285,7 @@ Certain files are always included, regardless of settings:
 * `README`
 * `LICENSE` / `LICENCE`
 * The file in the "main" field
+* The file(s) in the "bin" field
 
 `README` & `LICENSE` can have any case and extension.