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Clarify test documentation #4996

Job	Run time
arches	1s
mir-libs (amd64)	21m 16s
mir-libs (armhf)	56m 13s
mir-libs (arm64)	56m 51s
snap (canonical/mir-test-tools, amd64)	14m 58s
snap (canonical/mir-test-tools, armhf)	24m 2s
snap (canonical/mir-test-tools, arm64)	26m 45s
snap (canonical/confined-shell-wip, amd64)	8m 6s
snap (canonical/confined-shell-wip, armhf)	19m 24s
snap (canonical/confined-shell-wip, arm64)	20m 31s
snap (canonical/ubuntu-frame, amd64)	7m 58s
snap (canonical/ubuntu-frame, armhf)	19m 12s
snap (canonical/ubuntu-frame, arm64)	20m 49s
snap (Miriway/Miriway, amd64)	8m 26s
snap (Miriway/Miriway, armhf)	22m 35s
snap (Miriway/Miriway, arm64)	20m 25s
	5h 47m 32s

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