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Update beginner/README.md

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Co-authored-by: Lotte Steenbrink <lotte@zombietetris.de>
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@ -353,7 +353,7 @@ The Dongle will respond as soon as it receives a packet. If you insert a delay b
Having log statements between `send` and `recv_timeout` can also cause packets to be missed so try to keep those two calls as close to each other as possible and with as little code in between as possible.
> NOTE In a fully IEEE 802.15.4 compliant implementation one can mark a packet as "requires acknowledgment". The recipient must respond to these packets with an acknowledgment packet; if the sender doesn't receive the acknowledgment packet it will re-transmit the packet. This feature is part of the MAC layer and improves packet delivery rate but it is not implemented in the `Radio` API we are using so packet loss is possible even when the radios are close enough to communicate.
> NOTE Packet loss can always occur in wireless networks, even if the radios are close to each other. The `Radio` API we are using will not detect lost packets because it does not implement IEEE 802.15.4 Acknowledgement Requests. If you are having trouble with lost packets, consider adding a retry loop.
## Radio puzzle