Apply suggestions from code review

Co-authored-by: Daira Emma Hopwood <daira@jacaranda.org>

zcash_client_backend/src/data_api/wallet.rs

@@ -118,6 +118,7 @@ where
 ///   received note must have in the blockchain in order to be considered for being
 ///   spent. A value of 10 confirmations is recommended and 0-conf transactions are
 ///   not supported.
+/// * `change_memo`: A memo to be included in the change output
 ///
 /// # Examples
 ///
@@ -174,7 +175,8 @@ where
 ///     Amount::from_u64(1).unwrap(),
 ///     None,
 ///     OvkPolicy::Sender,
-///     10
+///     10,
+///     None
 /// )
 ///
 /// # }

zcash_client_backend/src/fees/fixed.rs

@@ -26,7 +26,8 @@ pub struct SingleOutputChangeStrategy {
 }
 
 impl SingleOutputChangeStrategy {
-    /// Constructs a new [`SingleOutputChangeStrategy`] with the specified fee rule.
+    /// Constructs a new [`SingleOutputChangeStrategy`] with the specified fee rule
+    /// and change memo.
     pub fn new(fee_rule: FixedFeeRule, change_memo: Option<MemoBytes>) -> Self {
         Self {
             fee_rule,

zcash_client_backend/src/fees/zip317.rs

@@ -34,7 +34,7 @@ pub struct SingleOutputChangeStrategy {
 
 impl SingleOutputChangeStrategy {
     /// Constructs a new [`SingleOutputChangeStrategy`] with the specified ZIP 317
-    /// fee parameters.
+    /// fee parameters and change memo.
     pub fn new(fee_rule: Zip317FeeRule, change_memo: Option<MemoBytes>) -> Self {
         Self {
             fee_rule,