Remove unit from modelled feerate

The FeeRate type abstracts away the unit.

Author: jamillambert

types/src/model/blockchain.rs

@@ -639,7 +639,7 @@ pub struct GetMempoolInfo {
     pub mempool_min_fee: Option<FeeRate>,
     /// Current minimum relay fee for transactions.
     pub min_relay_tx_fee: Option<FeeRate>,
-    /// Minimum fee rate increment for mempool limiting or replacement in BTC/kvB. v24 and later only.
+    /// Minimum fee rate increment for mempool limiting or replacement. v24 and later only.
     pub incremental_relay_fee: Option<FeeRate>,
     ///  Current number of transactions that haven't passed initial broadcast yet. v21 and later only.
     pub unbroadcast_count: Option<u32>,