Flags

Documentation: Imrpove "Contributing" (and amend Sphinx builders) #6732

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Run time

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Job	Run time
pre_job	8s
flags (9.10, ubuntu-latest)	5m 14s
flags (9.8, ubuntu-latest)	7m 16s
flags (9.6, ubuntu-latest)	8m 7s
flags (9.4, ubuntu-latest)	8m 31s
flags_post_job	1s
	29m 17s