removed an unintended this.HelpString-line
removed an unintended this.HelpString-line

--- a/KerbalEngineer/Flight/Readouts/Orbital/ManoeuvreNode/PostBurnApoapsis.cs
+++ b/KerbalEngineer/Flight/Readouts/Orbital/ManoeuvreNode/PostBurnApoapsis.cs
@@ -37,7 +37,6 @@
             this.Name = "Post-burn Apoapsis";
             this.Category = ReadoutCategory.GetCategory("Orbital");
             this.HelpString = "Farthest point of the vessel's ofbit after the burn.";
-            this.HelpString = String.Empty;
             this.IsDefault = false;
         }