Updated wiki links

core/src/mindustry/world/blocks/environment/OverlayFloor.java

@@ -4,7 +4,7 @@ import arc.graphics.g2d.*;
 import arc.math.*;
 import mindustry.world.*;
 
-/**A type of floor that is overlaid on top of over floors.*/
+/**A type of floor that is overlaid on top of other floors.*/
 public class OverlayFloor extends Floor{
 
     public OverlayFloor(String name){

core/src/mindustry/world/blocks/units/ControlCenter.java

@@ -1,16 +0,0 @@
-package mindustry.world.blocks.units;
-
-import mindustry.gen.*;
-import mindustry.world.*;
-
-public class ControlCenter extends Block{
-
-    public ControlCenter(String name){
-        super(name);
-        update = true;
-    }
-
-    public class ControlCenterBuild extends Building{
-
-    }
-}