fix(docs): fix outdated contribution section (#11683) #14608

Job	Run time
gitignore_correctness	40s
owlbot-py	48s
gapic-bom	1m 17s
generate-readme	47s
owlbot-yaml	40s
root-pom	1m 18s
package_name_check	42s
group_id_check_for_maps_libraries	5m 56s
	12m 8s

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