docs: update development guide #9701

Job	Run time
build (11)	14m 37s
build(21) except self-service clients	13m 36s
build (17)	14m 28s
build(8) except for gapic-generator-java	4m 23s
build(8) for gapic-generator-java	11m 19s
compatibility	1m 38s
lint	21s
showcase (11)	4m 33s
showcase (17)	4m 17s
showcase-clirr	2m 55s
showcase-native	8m 30s
showcase (21)	4m 21s
dependency_analyzer_unit_test	16s
gapic-generator-java-bom	1m 50s
unmanaged_dependency_check	3m 57s
	1h 31m 1s

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