add more doc #8898

Job	Run time
test-utils-py	18s
setup	2s
test-utils-js	18s
base-build-mac	16m 58s
full-build-base	50m 35s
bb-on-different-os (windows-latest)	16m 51s
base-build-windows	6m 18s
bb-on-different-os (macos-latest)	16m 31s
debug	-1s
installer-for-osx	0s
installer-for-debian	0s
installer-for-windows	0s
	1h 47m 50s

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