docs: clarify node announcement broadcast logic

Author: enigbe

README.md

@@ -60,6 +60,9 @@ LDK Node currently comes with a decidedly opinionated set of design choices:
 - Gossip data may be sourced via Lightning's peer-to-peer network or the [Rapid Gossip Sync](https://docs.rs/lightning-rapid-gossip-sync/*/lightning_rapid_gossip_sync/) protocol.
 - Entropy for the Lightning and on-chain wallets may be sourced from raw bytes or a [BIP39](https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki) mnemonic. In addition, LDK Node offers the means to generate and persist the entropy bytes to disk.
 
+**Note**: 
+Regarding node announcements, we have decided not to broadcast these announcements if either the node's listening addresses or its node alias are not set.
+
 ## Language Support
 LDK Node itself is written in [Rust][rust] and may therefore be natively added as a library dependency to any `std` Rust program. However, beyond its Rust API it also offers language bindings for [Swift][swift], [Kotlin][kotlin], and [Python][python] based on the [UniFFI](https://github.com/mozilla/uniffi-rs/). Moreover, [Flutter bindings][flutter_bindings] are also available.