Update comments and tooltips.

gui/qt/main_window.py

@@ -2756,7 +2756,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         multiple_change = self.wallet.multiple_change
         multiple_cb = QCheckBox(_('Multiple'))
         multiple_cb.setEnabled(self.wallet.use_change)
-        multiple_cb.setToolTip(_('If appropriate use up to 3 change addresses.'))
+        multiple_cb.setToolTip(_('If appropriate use up to 3 change addresses.\nThis might raise the transaction fee slightly.'))
         multiple_cb.setChecked(multiple_change)
         multiple_cb.stateChanged.connect(on_multiple)
         tx_widgets.append((usechange_cb, multiple_cb))

lib/coinchooser.py

@@ -228,12 +228,8 @@ class CoinChooserPrivacy(CoinChooserRandom):
     reduce blockchain UTXO bloat, and reduce future privacy loss that
     would come from reusing that address' remaining UTXOs.  Second, it
     penalizes change that is quite different to the sent amount.
-    Third, it penalizes change that is too big. Fourth, it breaks
+    Third, it penalizes change that is too big.  Transaction priority
-    large change up into amounts comparable to the spent amount.
+    might be less than if older coins were chosen.'''
-    Finally, change is rounded to similar precision to sent amounts.
-    Extra change outputs and rounding might raise the transaction fee
-    slightly.  Transaction priority might be less than if older coins
-    were chosen.'''
 
     def keys(self, coins):
         return [coin['address'] for coin in coins]