Update CONTRIBUTING.md

docs/CONTRIBUTING.md

@@ -140,7 +140,7 @@ Example:
     ```text
     GOOD: * [A Way-backed Interesting Book](https://web.archive.org/web/20211016123456/http://example.com/) - John Doe (HTML) *(:card_file_box: archived)*
     ```
-- <a id="license"></a>Free Licenses (While we include resources that are "All Rights Reserved" but free to read, we encourage the use of free Licenses, such as Creative Commons):
+- <a id="license"></a>Free Licenses (While we include resources that are "All Rights Reserved" but free to read, we encourage the use of free licenses, such as Creative Commons):
 
     ```text
     GOOD: * [A Very Awesome Book](https://example.org/book.pdf) - Jane Roe (PDF) (CC BY-SA)