update developer commentary

for weapon traits, crates and palettes
clarify that you don't need to update the wiki page manually

OpenRA.Game/Traits/World/Fog.cs

@@ -8,15 +8,12 @@
  */
 #endregion
 
+using OpenRA.FileFormats;
+
 namespace OpenRA.Traits
 {
-	public class FogInfo : TraitInfo<Fog>
-	{
-		/*
-		 * This tag trait will enable fog of war in ShroudRenderer.
-		 * Don't forget about HiddenUnderFog and FrozenUnderFog.
-		 */
-	}
+	[Desc("This tag trait will enable fog of war in ShroudRenderer. Don't forget about HiddenUnderFog and FrozenUnderFog.")]
+	public class FogInfo : TraitInfo<Fog> {	}
 	
 	public class Fog { }
 }