Drop unicode in documentation

Javadocs refuse unicode and as our rustdocs get copied over to Java
bindings (and thus get run through javadocs) we can't have unicode
in our rustdocs.

Author: TheBlueMatt

lightning/src/routing/scoring.rs

@@ -483,7 +483,7 @@ pub struct ProbabilisticScoringFeeParameters {
 	pub manual_node_penalties: HashMap<NodeId, u64>,
 
 	/// This penalty is applied when `htlc_maximum_msat` is equal to or larger than half of the
-	/// channel's capacity, (ie. htlc_maximum_msat ≥ 0.5 * channel_capacity) which makes us
+	/// channel's capacity, (ie. htlc_maximum_msat >= 0.5 * channel_capacity) which makes us
 	/// prefer nodes with a smaller `htlc_maximum_msat`. We treat such nodes preferentially
 	/// as this makes balance discovery attacks harder to execute, thereby creating an incentive
 	/// to restrict `htlc_maximum_msat` and improve privacy.