docs: use full dust exposure version string

Co-authored-by: Codex <codex@openai.com>

Author: Bortlesboat

lightning/src/ln/channel_state.rs

@@ -490,7 +490,7 @@ pub struct ChannelDetails {
 	/// [`ChannelConfig::max_dust_htlc_exposure`] to determine whether new HTLCs can be
 	/// accepted or offered on this channel.
 	///
-	/// This field will be `None` for objects serialized with LDK versions prior to 0.3.
+	/// This field will be `None` for objects serialized with LDK versions prior to 0.3.0.
 	///
 	/// [`ChannelConfig::max_dust_htlc_exposure`]: crate::util::config::ChannelConfig::max_dust_htlc_exposure
 	pub current_dust_exposure_msat: Option<u64>,