Merge pull request #5241 from dvdksn/docs-clarify-mount-from #3987

Job	Run time
prepare	1s
test / prepare	1m 56s
test / run (containerd, ./frontend/dockerfile, integration)	4m 30s
test / run (containerd, ./frontend/dockerfile, dockerfile)	7m 4s
test / run (containerd-rootless, ./frontend/dockerfile, integration)	4m 40s
test / run (containerd-rootless, ./frontend/dockerfile, dockerfile)	6m 49s
test / run (containerd-1.6, ./frontend/dockerfile, integration)	4m 29s
test / run (containerd-1.6, ./frontend/dockerfile, dockerfile)	7m 6s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, integration)	5m 38s
test / run (containerd-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	8m 42s
test / run (oci, ./frontend/dockerfile, integration)	4m 39s
test / run (oci, ./frontend/dockerfile, dockerfile)	6m 6s
test / run (oci-rootless, ./frontend/dockerfile, integration)	3m 57s
test / run (oci-rootless, ./frontend/dockerfile, dockerfile)	5m 58s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, integration)	4m 17s
test / run (oci-rootless-slirp4netns-detachnetns, ./frontend/dockerfile, dockerfile)	5m 16s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, integration)	4m 7s
test / run (oci-snapshotter-stargz, ./frontend/dockerfile, dockerfile)	6m 7s
image (mainline)	5m 32s
image (labs)	5m 35s
scout (master)	33s
scout (master-labs)	32s
release	0s
	1h 43m 34s

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