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docs: fix stale FEATURES.md refs to docs/features.md #451

Job	Run time
secrets	11s
vet	22s
duplication	13s
deadcode	37s
markdown	10s
module hygiene	27s
format	28s
security	0s
lint	-1s
smoke	-1s
build (${{ matrix.goos }}/${{ matrix.goarch }})	-1s
test (race + coverage)	-1s
	2m 24s