address PR review comment about licence

Author: namiroues

documentation.md

@@ -4,7 +4,7 @@ title: Documentation
 order: 5
 ---
 
-The [MDAnalysis library]({{ site.github.repo }}) (`import MDAnalysis`) is open-source code, available under the [GNU Lesser General Public License, version 2.1 or later (LGPLv2.1+)](https://www.gnu.org/licenses/lgpl-2.1.html). MDAnalysis provides **comprehensive documentation** to help users at all levels—whether you're just getting started, developing new tools, or contributing to the project. From **step-by-step tutorials** to an in-depth **API reference**, these resources will guide you through installing, using, and extending MDAnalysis.
+The [MDAnalysis library]({{ site.github.repo }}) (`import MDAnalysis`) is open-source code, available under the [GNU Lesser General Public License, version 3 or later (LGPLv3+)](https://www.gnu.org/licenses/lgpl-3.0.html). MDAnalysis provides **comprehensive documentation** to help users at all levels—whether you're just getting started, developing new tools, or contributing to the project. From **step-by-step tutorials** to an in-depth **API reference**, these resources will guide you through installing, using, and extending MDAnalysis.
 
 The MDAnalysis Project maintains many other software projects related to working with data in the molecular sciences, which can be found under the [MDAnalysis GitHub organization](https://github.com/MDAnalysis).