f - fix error message

Author: jkczyz

lightning/src/ln/channel.rs

@@ -10682,7 +10682,7 @@ where
 		if our_funding_contribution < -SignedAmount::MAX_MONEY {
 			return Err(APIError::APIMisuseError {
 				err: format!(
-					"Channel {} cannot be spliced out; contribution exceeds total bitcoin supply: {}",
+					"Channel {} cannot be spliced out; contribution exhausts total bitcoin supply: {}",
 					self.context.channel_id(),
 					our_funding_contribution,
 				),