Update servers installation instructions

docs/en/SUMMARY.md

@@ -16,7 +16,7 @@
     * [Windows](installation/windows.md)
     * [Vagrant](installation/vagrant.md)
     * [Docker](installation/docker.md)
-  * [Production and Staging servers](installation/servers.md)
+  * [Production and staging servers](installation/servers.md)
     * [Installer](installation/installer.md)
     * [Create a deploy user](installation/create_deploy_user.md)
     * [Generating SSH Key](installation/generating_ssh_key.md)

docs/en/installation/servers.md

@@ -1,21 +1,21 @@
-# Production and Staging servers
+# Production and staging servers
 
-## Recommended Minimum System Requirements
+## Recommended minimum system requirements
 
-### 1. Production Server
+### 1. Production server
 
-- Distribution: Ubuntu 16.04.X
+- Supported distributions: Ubuntu 22.04, Ubuntu 24.04, Debian Bullseye or Debian Bookworm
 - RAM: 32GB
 - Processor: Quad core
 - Hard Drive: 20 GB
 - Database: Postgres
 
-### 2. Staging Server
+### 2. Staging server
 
-- Distribution: Ubuntu 16.04.X
+- Supported distributions: Ubuntu 22.04, Ubuntu 24.04, Debian Bullseye or Debian Bookworm
 - RAM: 16GB
 - Processor: Dual core
 - Hard Drive: 20 GB
 - Database: Postgres
 
-If your city has a population of over 1.000.000, consider balancing your load using 2-3 production servers and a separate server for the database.
+If your city has a population of over 1,000,000, consider balancing your load using 2-3 production servers and a separate server for the database.