boards: nxp: imx943_evk: doc update for NETC switch support for M33

Added NETC switch support for M33 in doc.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>

Author: yangbolu1991

boards/nxp/imx943_evk/doc/index.rst

@@ -65,10 +65,12 @@ CPU's UART1 for Cortex-A55, and UART8 for Cortex-M33.
 Ethernet
 --------
 
-NETC driver supports to manage the Physical Station Interface (PSI).
+NETC driver supports to manage the Physical Station Interface (PSI), and TSN switch.
 The ENET0, ENETC1, ENETC2 ports could be enabled for M33 by west build option
 ``-DEXTRA_DTC_OVERLAY_FILE=enetc.overlay``.
 
+The two switch ports could be verified via :zephyr:code-sample:`dsa`.
+
 Programming and Debugging (A55)
 *******************************