docs: remove dns discover #72

Job	Run time
build / Build (8)	1m 18s
build / Build (17)	1m 19s
build / Build (11)	1m 23s
Tests (Previous LTS) / load_configuration / load	4s
Tests (Previous LTS) / Secure (Streams)	1m 40s
Tests (Previous LTS) / Single node (MultiStreamAppend)	1m 37s
Tests (Previous LTS) / Single node (Streams)	1m 40s
Tests (Previous LTS) / Single node (Telemetry)	1m 34s
Tests (Previous LTS) / Cluster (MultiStreamAppend)	1m 33s
Tests (Previous LTS) / Single node (PersistentSubscriptions)	2m 7s
Tests (Previous LTS) / Cluster (Streams)	1m 37s
Tests (Previous LTS) / Cluster (PersistentSubscriptions)	1m 51s
Tests (Previous LTS) / Secure (PersistentSubscriptions)	2m 2s
	19m 45s

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