feat: allow mopping evaporating puddles (#38743)

Content.Server/Fluids/EntitySystems/PuddleSystem.Evaporation.cs

@@ -46,6 +46,7 @@ public sealed partial class PuddleSystem
             if (!_solutionContainerSystem.ResolveSolution(uid, puddle.SolutionName, ref puddle.Solution, out var puddleSolution))
                 continue;
 
+            // Yes, this means that 50u water + 50u holy water evaporates twice as fast as 100u water.
             foreach ((string evaporatingReagent, FixedPoint2 evaporatingSpeed) in GetEvaporationSpeeds(puddleSolution))
             {
                 var reagentTick = evaporation.EvaporationAmount * EvaporationCooldown.TotalSeconds * evaporatingSpeed;