Bugfix: Fix a variety of misspellings

src/qt/bitcoinunits.h

@@ -5,7 +5,7 @@
 #include <QAbstractListModel>
 
 /** Bitcoin unit definitions. Encapsulates parsing and formatting
-   and serves as list model for dropdown selection boxes.
+   and serves as list model for drop-down selection boxes.
 */
 class BitcoinUnits: public QAbstractListModel
 {
@@ -26,7 +26,7 @@ public:
     //! Unit conversion and formatting
     ///@{
 
-    //! Get list of units, for dropdown box
+    //! Get list of units, for drop-down box
     static QList<Unit> availableUnits();
     //! Is unit ID valid?
     static bool valid(int unit);
@@ -49,7 +49,7 @@ public:
     ///@}
 
     //! @name AbstractListModel implementation
-    //! List model for unit dropdown selection box.
+    //! List model for unit drop-down selection box.
     ///@{
     enum RoleIndex {
         /** Unit identifier */