docs: update development guide (#3480) #9702

Job	Run time
build (11)	14m 41s
build (17)	14m 47s
build(8) except for gapic-generator-java	4m 20s
build(21) except self-service clients	13m 21s
build(8) for gapic-generator-java	11m 20s
compatibility	1m 39s
dependency_analyzer_unit_test	29s
gapic-generator-java-bom	1m 44s
lint	24s
showcase (11)	4m 26s
showcase (17)	4m 32s
showcase-clirr	0s
showcase (21)	4m 38s
showcase-native	8m 59s
unmanaged_dependency_check	5m 6s
	1h 30m 26s

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