f update last-updated docs

Author: TheBlueMatt

lightning/src/routing/scoring.rs

@@ -789,7 +789,7 @@ struct ChannelLiquidity {
 	min_liquidity_offset_history: HistoricalBucketRangeTracker,
 	max_liquidity_offset_history: HistoricalBucketRangeTracker,
 
-	/// Time when the liquidity bounds were last modified as an offset since the unix epoch.
+	/// Time when either liquidity bound was last modified as an offset since the unix epoch.
 	last_updated: Duration,
 
 	/// Time when the historical liquidity bounds were last modified as an offset against the unix