This means that if you configured it, Fn + Key(1,1) could now send the letter "z" (scancode 0x1D). For example, Fn keys are typically used to switch between virtual "layers". There are some keys and that combinations which don't get sent down the USB wire at all. If you configure QMK Firmware to say that Key(1,1) is the letter "a", whenever you hit Key(1,1), it will send the letter "a" (scancode 0x04) down the USB wire. When you press a key on your keyboard the QMK Firmware inside the keyboard interprets the key presses and creates a set of keycodes of what exactly to send down the USB wire to the OS. QMK has a good diagram of how keyboards work: +-+ +-+ +-+ +-+ +-+
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