gongyantao b84950db53 docs(examples/bluetooth): Add the sequence diagram of L2CAP connection and the discription for the sequence diagram
1: add the sequence diagram for the bluetooth example projects,bt_l2cap_server and bt_l2cap_client, which implenment the L2CAP connection.
2: add the discription for the sequence diagram.
2023-07-07 20:12:05 +08:00
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