document notes about Azure AD #7507

Job	Run time
pre-ci	8s
v3.2.x-self-ubuntu20-linux-gcc-lean	2m 56s
v3.2.x-self-ubuntu20-linux-gcc	3m 1s
v3.2.x-self-ubuntu20-linux-gcc-reproducible	3m 7s
v3.2.x-self-ubuntu20-linux-gcc-O2-g3	3m 15s
v3.2.x-self-ubuntu20-linux-clang-lean	4m 39s
v3.2.x-self-ubuntu20-linux-clang	4m 58s
v3.2.x-self-ubuntu20-linux-clang-altlibs	5m 4s
v3.2.x-self-ubuntu20-linux-clang-reproducible	4m 43s
v3.2.x-self-ubuntu20-linux-clang-sanitizer	6m 42s
v3.2.x-self-ubuntu20-linux-clang-O2-g3	4m 36s
Merge preflight	0s
Merge into upstream	0s
	43m 9s

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