boards: nxp: imx943_evk: doc: add i2c into index.rst

Add i2c into index.rst.

Signed-off-by: Biwen Li <[email protected]>

Author: biwenli

boards/nxp/imx943_evk/doc/index.rst

@@ -69,6 +69,11 @@ NETC driver supports to manage the Physical Station Interface (PSI).
 The ENET0, ENETC1, ENETC2 ports could be enabled for M33 by west build option
 ``-DEXTRA_DTC_OVERLAY_FILE=enetc.overlay``.
 
+I2C
+---
+
+Enable lpi2c6 defaultly for M33(In NETC MIX).
+
 Programming and Debugging (A55)
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