docs: release: Add notes on Zephyr USB fixes and boot serial echo #1616

Job	Run time
environment (esp32, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secureb...	2m 12s
environment (esp32, serialrecovery)	3m 23s
environment (esp32s2, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	2m 5s
environment (esp32s2, serialrecovery)	1m 24s
environment (esp32s3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	3m 36s
environment (esp32s3, serialrecovery)	2m 55s
environment (esp32c3, secureboot-sign-rsa2048,secureboot-sign-rsa3072,secureboot-sign-ec256,secur...	2m 10s
environment (esp32c3, serialrecovery)	2m 10s
environment (esp32, multi-image,multi-boot, multi)	1m 38s
environment (esp32s3, multi-image,multi-boot, multi)	1m 36s
	23m 9s

Provide feedback