[DOCs] Documented the available columns for the BoM #2140

Job	Run time
test_indep	3m 25s
test (ki5, g1)	5m 11s
test (ki5, g2)	3m 44s
test (ki5, g3)	3m 0s
test (ki6, g1)	5m 32s
test (ki6, g2)	5m 28s
test (ki6, g3)	4m 26s
test (ki7, g1)	5m 55s
test (ki7, g2)	6m 22s
test (ki7, g3)	5m 36s
test (ki8, g1)	5m 50s
test (ki8, g2)	6m 1s
test (ki8, g3)	5m 57s
Finish Coveralls	3s
Consolidate coverage data	1m 18s
Triggers the docker images creation	3s
	1h 7m 51s

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