Fix FindActorsOnCircle summary

The summary was not entirely correct:
Since FAOC simply adds the largest existing OuterRadius to the specified circle range, it's still possible (very likely, in fact) for this helper to return actors whose HitShape is entirely outside the specified range (*without* the added largest OuterRadius).

OpenRA.Mods.Common/WorldExtensions.cs

@@ -71,7 +71,7 @@ namespace OpenRA.Mods.Common
 		}
 
 		/// <summary>
-		/// Finds all the actors of which their health radius is intersected by a specified circle.
+		/// Finds all the actors of which their health radius might be intersected by a specified circle.
 		/// </summary>
 		public static IEnumerable<Actor> FindActorsOnCircle(this World world, WPos origin, WDist r)
 		{