Mention user_channel_id rand. version req.

As it was previously omitted, we clarify here starting from which version users can expect the `user_channel_id` to be randomized for inbound channels.

Author: tnull

lightning/src/ln/channelmanager.rs

@@ -1087,7 +1087,8 @@ pub struct ChannelDetails {
 	/// [`outbound_capacity_msat`]: ChannelDetails::outbound_capacity_msat
 	pub unspendable_punishment_reserve: Option<u64>,
 	/// The `user_channel_id` passed in to create_channel, or a random value if the channel was
-	/// inbound.
+	/// inbound. This may be zero for inbound channels serialized with LDK versions prior to
+	/// 0.0.113.
 	pub user_channel_id: u128,
 	/// Our total balance.  This is the amount we would get if we close the channel.
 	/// This value is not exact. Due to various in-flight changes and feerate changes, exactly this

lightning/src/util/events.rs

@@ -319,7 +319,8 @@ pub enum Event {
 		/// The script which should be used in the transaction output.
 		output_script: Script,
 		/// The `user_channel_id` value passed in to [`ChannelManager::create_channel`], or a
-		/// random value for an inbound channel.
+		/// random value for an inbound channel. This may be zero for objects serialized with LDK
+		/// versions prior to 0.0.113.
 		///
 		/// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
 		user_channel_id: u128,
@@ -632,8 +633,9 @@ pub enum Event {
 		/// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
 		/// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
 		/// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
-		/// `user_channel_id` will be randomized for an inbound channel.
-		/// This will always be zero for objects serialized with LDK versions prior to 0.0.102.
+		/// `user_channel_id` will be randomized for inbound channels.
+		/// This may be zero for inbound channels serialized prior to 0.0.113 and will always be
+		/// zero for objects serialized with LDK versions prior to 0.0.102.
 		///
 		/// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
 		/// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel