doc: update docs for CHECK_ATOMIC macro #572

Job	Run time
Lint	42s
ARM [GOAL install] [buster]	11m 57s
Win32	13m 33s
macOS 12 native [GOAL install] [GUI] [no depends]	13m 45s
Win64	30m 45s
i386 Linux [GOAL install] [focal]	12m 4s
x86_64 Linux [GOAL install] [GUI] [focal] [no depends]	15m 55s
x86_64 Linux [GOAL install] [GUI] [bionic] [no depends]	14m 39s
macOS 10.14 [GOAL deploy] [GUI] [no tests] [focal]	28m 23s
	2h 21m 43s

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