doc, cpp: Update CXX support to show exception support
doc, cpp: Update CXX support to show exception support

Updates CXX support documentation to reflect exception support
added in fixes for #32448 and #35772.

Signed-off-by: Lauren Murphy <ce8d3478b631de4cc130a07ddd0282d1734fed61@intel.com>

galak/zephyr,galak/zephyr,finikorg/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr