ML-KEM: fix comments, API signatures, minor issues #837

Job	Run time
load-targets	7s
analyze (gcc-arm-cortex-m4-baremetal, gcc-arm, cortex-m4-baremetal, sudo apt-get update && sudo a...	1m 57s
analyze (gcc-arm-cortex-m4-min-ecc, gcc-arm, cortex-m4-min-ecc, sudo apt-get update && sudo apt-g...	2m 9s
analyze (gcc-arm-cortex-m4, gcc-arm, cortex-m4, sudo apt-get update && sudo apt-get install -y gc...	2m 14s
analyze (gcc-arm-cortex-m4-tls12, gcc-arm, cortex-m4-tls12, sudo apt-get update && sudo apt-get i...	2m 6s
	8m 33s

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