Add additional note that manual opt outs are handled by a different p… #3798

Job	Run time
test-rediscache	6m 25s
test (14.x)	6m 6s
test (15.x)	6m 3s
test-rediscache-contactcache	5m 44s
test (16.x)	6m 3s
test (18.x)	6m 12s
test (20.x)	5m 56s
test-sqlite	5m 45s
	48m 14s

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