embed the previously manually edited outdated documentation

from https://github.com/OpenRA/OpenRA/wiki/Trait-Documentation

OpenRA.Mods.RA/Effects/Missile.cs

@@ -13,6 +13,7 @@ using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
 using OpenRA.Effects;
+using OpenRA.FileFormats;
 using OpenRA.GameRules;
 using OpenRA.Graphics;
 using OpenRA.Traits;
@@ -29,6 +30,7 @@ namespace OpenRA.Mods.RA.Effects
 		public readonly string Trail = null;
 		public readonly float Inaccuracy = 0;
 		public readonly string Image = null;
+		[Desc("Rate of Turning")]
 		public readonly int ROT = 5;
 		public readonly int RangeLimit = 0;
 		public readonly bool TurboBoost = false;