Test

fix: upd signed streams docs + deprecate http_broadcast_secret #750

Job	Run time
test-macos	3m 34s
test	2m 24s
test-conformance (benchmarks)	3m 50s
test-conformance (test-features)	3m 24s
test-conformance (test-conformance)	2m 37s
test-conformance (test-conformance-http)	2m 35s
test-conformance (test-conformance-nats)	2m 58s
test-conformance (test-conformance-nats-embedded)	2m 51s
test-conformance (test-conformance-ssl)	2m 35s
test-conformance (test-conformance-broker-http)	2m 44s
test-conformance (test-conformance-broker-redis)	2m 56s
test-conformance (test-conformance-broker-nats)	2m 44s
test-conformance (test-conformance-embedded)	2m 56s
coverage	8s
	38m 16s

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