add v2 flag suggestion endpoints to feature flags spec #17562

Job	Run time
test / test (3.2, ubuntu-latest)	2m 34s
pre-commit / pre-commit	1m 17s
examples / examples	2m 42s
test / test (2.7, ubuntu-latest)	2m 40s
test / test (jruby-9.4.12.0, ubuntu-latest)	2m 54s
report	10s
	12m 17s

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