Fix incorrect disk drive method name

The previous comment was wrong, and I never double checked. Closes #472.

src/main/java/dan200/computercraft/shared/peripheral/diskdrive/DiskDrivePeripheral.java

@@ -104,7 +104,7 @@ public class DiskDrivePeripheral implements IPeripheral
     }
 
     @LuaFunction
-    public final void eject()
+    public final void ejectDisk()
     {
         diskDrive.ejectDisk();
     }