docs: Add origin_snapshot block decription for aws_fsx_openzfs_volume #32020

Job	Run time
markdown-link-check-a-h-markdown	4m 20s
markdown-link-check-i-z-markdown	6m 15s
markdown-link-check-md	25s
markdown-lint	31s
misspell	25s
terrafmt	37s
tflint	23m 25s
	35m 58s

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