`Layout::Grid` - documentation (HDS-4650) #14458

Job	Run time
Get files changed and conditionally skip CI	11s
Tests	6m 6s
ember-lts-3.28	5m 19s
ember-lts-4.12	3m 0s
ember-beta	3m 3s
embroider-safe	3m 17s
embroider-optimized	1m 10s
	22m 6s

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