Updates end of maintenance messaging to be in the past tense (#843)

* Tense for EOM

* Update README.md

* Update index.md

Author: JasonWeill

README.md

@@ -28,7 +28,7 @@ You will need to have installed the following software to use Jupyter AI:
 In addition, you will need access to at least one model provider.
 
 > [!IMPORTANT]
-> JupyterLab 3 will reach its end of maintenance date on May 15, 2024, anywhere on Earth. As a result, we will not backport new features to the v1 branch supporting JupyterLab 3 after this date. Fixes for critical issues will still be backported until December 31, 2024. If you are still using JupyterLab 3, we strongly encourage you to **upgrade to JupyterLab 4 as soon as possible**. For more information, see [JupyterLab 3 end of maintenance](https://blog.jupyter.org/jupyterlab-3-end-of-maintenance-879778927db2) on the Jupyter Blog.
+> JupyterLab 3 reached its end of maintenance date on May 15, 2024. As a result, we will not backport new features to the v1 branch supporting JupyterLab 3. Fixes for critical issues will still be backported until December 31, 2024. If you are still using JupyterLab 3, we strongly encourage you to **upgrade to JupyterLab 4 as soon as possible**. For more information, see [JupyterLab 3 end of maintenance](https://blog.jupyter.org/jupyterlab-3-end-of-maintenance-879778927db2) on the Jupyter Blog.
 
 ## Setting Up Model Providers in a Notebook
 

docs/source/users/index.md

@@ -26,7 +26,7 @@ See "Installation" for more details.
 
 :::{attention}
 :name: jupyter-lab-3-end-of-maintenance
-JupyterLab 3 will reach its end of maintenance date on May 15, 2024, anywhere on Earth. As a result, we will not backport new features to the v1 branch supporting JupyterLab 3 after this date. Fixes for critical issues will still be backported until December 31, 2024. If you are still using JupyterLab 3, we strongly encourage you to **upgrade to JupyterLab 4 as soon as possible**. For more information, see [JupyterLab 3 end of maintenance](https://blog.jupyter.org/jupyterlab-3-end-of-maintenance-879778927db2) on the Jupyter Blog.
+JupyterLab 3 reached its end of maintenance date on May 15, 2024. As a result, we will not backport new features to the v1 branch supporting JupyterLab 3. Fixes for critical issues will still be backported until December 31, 2024. If you are still using JupyterLab 3, we strongly encourage you to **upgrade to JupyterLab 4 as soon as possible**. For more information, see [JupyterLab 3 end of maintenance](https://blog.jupyter.org/jupyterlab-3-end-of-maintenance-879778927db2) on the Jupyter Blog.
 :::
 
 You can install JupyterLab using `pip` or `conda`.