docs: Add LGPL v3 and zlib as accepted extension licenses (#46242)

Follow-up to https://github.com/zed-industries/extensions/pull/4397

Release Notes:

- N/A

docs/src/extensions/developing-extensions.md

@@ -117,7 +117,9 @@ The following licenses are accepted:
 - [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0)
 - [BSD 3-Clause](https://opensource.org/license/bsd-3-clause)
 - [GNU GPLv3](https://www.gnu.org/licenses/gpl-3.0.en.html)
+- [GNU LGPLv3](https://www.gnu.org/licenses/lgpl-3.0.en.html)
 - [MIT](https://opensource.org/license/mit)
+- [zlib](https://opensource.org/license/zlib)
 
 This allows us to distribute the resulting binary produced from your extension code to our users.
 Without a valid license, the pull request to add or update your extension in the following steps will fail CI.