Add some documentation to support powers.

OpenRA.Mods.Common/Traits/SupportPowers/SupportPower.cs

@@ -14,6 +14,7 @@ namespace OpenRA.Mods.Common.Traits
 {
 	public abstract class SupportPowerInfo : ITraitInfo
 	{
+		[Desc("Measured in seconds.")]
 		public readonly int ChargeTime = 0;
 		public readonly string Icon = null;
 		public readonly string Description = "";
@@ -42,6 +43,8 @@ namespace OpenRA.Mods.Common.Traits
 		public readonly string BeaconPosterPalette = "chrome";
 
 		public readonly bool DisplayRadarPing = false;
+
+		[Desc("Measured in ticks.")]
 		public readonly int RadarPingDuration = 5 * 25;
 
 		public readonly string OrderName;