`Layout::Flex` - documentation #14495

Job	Run time
Get files changed and conditionally skip CI	12s
Tests	6m 15s
ember-lts-3.28	5m 39s
ember-lts-4.12	3m 9s
ember-beta	2m 56s
embroider-safe	3m 20s
embroider-optimized	1m 5s
	22m 36s

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