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Update faq.txt

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@ -30,7 +30,7 @@ corresponding pins with your display.
All U8g2 software emulated SPI constructors look like this:
U8G2_..._4W_SW_SPI u8g2(U8G2_R0, clock, data, cs, dc, reset);
All U8g2 hardware SPI constructors look like this:
U8G2_..._4W_SW_SPI u8g2(U8G2_R0, cs, dc, reset);
U8G2_..._4W_HW_SPI u8g2(U8G2_R0, cs, dc, reset);
Q: For HW I2C no pin numbers are required in the constructor. But which are
the pin numbers for wiring?