`Layout::Grid` - documentation (HDS-4650) #14456

Job	Run time
Get files changed and conditionally skip CI	13s
Tests	6m 0s
ember-lts-3.28	3s
ember-lts-4.12	1s
ember-beta	3s
embroider-safe	2s
embroider-optimized	2s
	6m 24s

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