kc705: fix SFP GTX polarity
TX was wrong for old boards. RX was wrong for new boards. Use the new (rev1.1+) polarities. Add note about swapping for old boards. UG810: On KC705 boards prior to Rev 1.1, SFP+ connector P5 pin 18 RD_P is connected to net SFP_RX_N, and pin 19 RD_N is connected to net SFP_RX_P. On KC705 boards prior to Rev 1.1, SFP+ connector P5 pin 18 TD_P is connected to net SFP_TX_N, and pin 19 TD_N is connected to net SFP_TX_P.
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