doc: releases: 3.1: add CAN related release notes#45576

mbolivar-nordic merged 2 commits intozephyrproject-rtos:mainzephyrproject-rtos/zephyr:mainfrom

vestas-wind-systems:can_relnotes_v3_1vestas-wind-systems/zephyr:can_relnotes_v3_1Copy head branch name to clipboard