Rename "Server Info" to ServerInfo (#15436)

Content.Server/Info/InfoSystem.cs

@@ -6,7 +6,7 @@ using Robust.Shared.Log;
 
 namespace Content.Server.Info;
 
-public class InfoSystem : EntitySystem
+public sealed class InfoSystem : EntitySystem
 {
     [Dependency] private readonly IResourceManager _res = default!;
     [Dependency] private readonly IConfigurationManager _cfg = default!;