CBL Replication with Sync Gateway: Missing the use of acceptOnlySelfSignedCert

Reference https://forums.couchbase.com/t/server-tls-certificate-untrusted-error-connecting-to-sync-gateway/29087/5

1) CBL Android replication section should add a NOTE upfront to indicate the use of the cleartext property in manifest- similar to what was done in p2p https://docs.couchbase.com/couchbase-lite/current/java/advance/java-p2psync-websocket-using-active.html#authenticating-the-listener

2) Use of isAcceptOnlySelfSignedServerCertificate() in context of SGW replication is not described. Behavior is the same as p2p.