Update server requirements documentation to emphasize LTS version for Ubuntu

- Clarified the operating system requirement by specifying that Ubuntu 22.04 LTS or newer must be an LTS version, enhancing user understanding of system prerequisites.

Author: jaydrogers

docs/content/docs/4.server-configuration/1.server-requirements.md

@@ -49,7 +49,7 @@ Hardware specs largely depend on your project, but even for simple apps, we reco
 - **RAM**: 1GB
 - **Storage**: >25GB SSD
 - **Architecture**: x86_64 (64-bit) [[request ARM64 support](https://github.com/serversideup/spin/discussions/9)]
-- **Operating System**: Ubuntu 22.04 LTS or newer
+- **Operating System**: Ubuntu 22.04 LTS or newer ([**must be an LTS version**](https://ubuntu.com/about/release-cycle))
 - **Snapshots/Backups**: Highly recommended
 - **Firewall**: Configured to allow SSH and HTTPS traffic (22/tcp, 80/tcp, 443/tcp, 2222/tcp)
 - **Access**: Root SSH access is required