Fix typo

worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/NoiseFilter.java

@@ -80,7 +80,7 @@ public class NoiseFilter extends AbstractMask {
      */
     public void setDensity(double density) {
         checkArgument(density >= 0, "density must be >= 0");
-        checkArgument(density <= 1, "density must be >= 1");
+        checkArgument(density <= 1, "density must be <= 1");
         this.density = density;
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/function/mask/NoiseFilter2D.java

@@ -78,7 +78,7 @@ public class NoiseFilter2D extends AbstractMask2D {
      */
     public void setDensity(double density) {
         checkArgument(density >= 0, "density must be >= 0");
-        checkArgument(density <= 1, "density must be >= 1");
+        checkArgument(density <= 1, "density must be <= 1");
         this.density = density;
     }