docs(wallet): improve docs for load_with_params

- keychain_txout: remove broken rustdoc link

Author: ValuedMammal

crates/chain/src/indexer/keychain_txout.rs

@@ -105,7 +105,6 @@ pub const DEFAULT_LOOKAHEAD: u32 = 25;
 /// ```
 ///
 /// [`Ord`]: core::cmp::Ord
-/// [`SpkTxOutIndex`]: crate::spk_txout_index::SpkTxOutIndex
 /// [`Descriptor`]: crate::miniscript::Descriptor
 /// [`reveal_to_target`]: Self::reveal_to_target
 /// [`reveal_next_spk`]: Self::reveal_next_spk

crates/wallet/src/wallet/mod.rs

@@ -478,7 +478,7 @@ impl Wallet {
 
     /// Load [`Wallet`] from the given previously persisted [`ChangeSet`] and `params`.
     ///
-    /// Refer to [`Wallet::load`] for more.
+    /// Returns `Ok(None)` if the changeset is empty. Refer to [`Wallet::load`] for more.
     pub fn load_with_params(
         changeset: ChangeSet,
         params: LoadParams,