Add method comment

Libraries/SPTarkov.Server.Core/Helpers/WeatherHelper.cs

@@ -70,6 +70,11 @@ public class WeatherHelper(ISptLogger<WeatherHelper> logger, TimeUtil timeUtil,
         return time.Hour is > 21 or < 5;
     }
 
+    /// <summary>
+    ///     Is the provided hour at night, nighttime is after 2100 and before 0600
+    /// </summary>
+    /// <param name="currentHour">Hour to check</param>
+    /// <returns>True if nighttime hour</returns>
     public bool IsHourAtNightTime(int currentHour)
     {
         return currentHour is > 21 or <= 5;