embed the previously manually edited outdated documentation

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

OpenRA.Mods.RA/Buildings/Building.cs

@@ -16,14 +16,19 @@ using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Buildings
 {
+	[Desc("Remove this trait to limit base-walking by cheap or defensive buildings.")]
 	public class GivesBuildableAreaInfo : TraitInfo<GivesBuildableArea> {}
 	public class GivesBuildableArea {}
 
 	public class BuildingInfo : ITraitInfo, UsesInit<LocationInit>
 	{
+		[Desc("If negative, it will drain power, if positive, it will provide power.")]
 		public readonly int Power = 0;
+		[Desc("Where you are allowed to place the building (Water, Clear, ...)")]
 		public readonly string[] TerrainTypes = {};
+		[Desc("The range to the next building it can be constructed. Set it higher for walls.")]
 		public readonly int Adjacent = 2;
+		[Desc("x means space it blocks, _ is a part that is passable by actors (like bridges).")]
 		public readonly string Footprint = "x";
 		public readonly int2 Dimensions = new int2(1, 1);
 

OpenRA.Mods.RA/Buildings/CustomBuildTimeValue.cs

@@ -8,12 +8,12 @@
  */
 #endregion
 
+using OpenRA.FileFormats;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Buildings
 {
-	// allow a nonstandard build time value for a cnc classic mod
-
+	[Desc("Overrides the build time calculated by actor value.")]
 	public class CustomBuildTimeValueInfo : TraitInfo<CustomBuildTimeValue>
 	{
 		public readonly int Value = 0;

OpenRA.Mods.RA/Buildings/CustomSellValue.cs

@@ -8,13 +8,12 @@
  */
 #endregion
 
+using OpenRA.FileFormats;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Buildings
 {
-	// allow a nonstandard sell/repair value to avoid
-	// buy-sell exploits like c&c's PROC.
-
+	[Desc("Allow a non-standard sell/repair value to avoid buy-sell exploits.")]
 	public class CustomSellValueInfo : TraitInfo<CustomSellValue>
 	{
 		public readonly int Value = 0;

OpenRA.Mods.RA/Buildings/LineBuild.cs

@@ -8,12 +8,15 @@
  */
 #endregion
 
+using OpenRA.FileFormats;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Buildings
 {
+	[Desc("Place the second actor in line to build more of the same at once (used for walls).")]
 	public class LineBuildInfo : TraitInfo<LineBuild>
 	{
+		[Desc("The maximum allowed length of the line.")]
 		public readonly int Range = 5;
 	}
 

OpenRA.Mods.RA/Buildings/RepairableBuilding.cs

@@ -11,9 +11,11 @@
 using System;
 using OpenRA.Mods.RA.Effects;
 using OpenRA.Traits;
+using OpenRA.FileFormats;
 
 namespace OpenRA.Mods.RA.Buildings
 {
+	[Desc("Building can be repaired by the repair button.")]
 	public class RepairableBuildingInfo : ITraitInfo, Requires<HealthInfo>
 	{
 		public readonly int RepairPercent = 20;