boards: nxp: frdm_mcxa156: update doc index

Update board overview and hardware configuration

Signed-off-by: Neil Chen <cheng.chen_1@nxp.com>

Author: NeilChen93

boards/nxp/frdm_mcxa156/doc/index.rst

@@ -4,20 +4,20 @@ Overview
 ********
 
 FRDM-MCXA156 are compact and scalable development boards for rapid prototyping of
-MCX A15X MCUs. They offer industry standard headers for easy access to the
-MCUs I/Os, integrated open-standard serial interfaces, external flash memory and
-an on-board MCU-Link debugger. MCX N Series are high-performance, low-power
-microcontrollers with intelligent peripherals and accelerators providing multi-tasking
-capabilities and performance efficiency.
+MCX A144/5/6 A154/5/6 MCUs. They offer industry standard headers for easy access
+to the MCU's I/Os, integrated open-standard serial interfaces, external flash
+memory and an on-board MCU-Link debugger. Additional tools like our Expansion
+Board Hub for add-on boards and the Application Code Hub for software examples
+are available through the MCUXpresso Developer Experience.
 
 Hardware
 ********
 
 - MCX-A156 Arm Cortex-M33 microcontroller running at 96 MHz
 - 1MB dual-bank on chip Flash
 - 128 KB RAM
-- USB high-speed (Host/Device) with on-chip HS PHY. HS USB Type-C connectors
-- 2x FlexCAN with FD, 2x I3Cs, 2x SAI
+- USB full-speed with on-chip FS PHY. USB Type-C connectors
+- 1x FlexCAN with FD, 1x I3Cs
 - On-board MCU-Link debugger with CMSIS-DAP
 - Arduino Header, FlexIO/LCD Header, SmartDMA/Camera Header, mikroBUS