Qt: ElidedLabel cleanup

Add Doxygen documentaiton and fix a clazy-qstring-arg warning.

ui/qt/widgets/elided_label.cpp

@@ -56,10 +56,7 @@ void ElidedLabel::updateText()
 
     if (url_.length() > 0) {
         label_text.prepend(ColorUtils::themeLinkStyle());
-        label_text.append(QString("<a href=\"%1\">%2</a>")
-                .arg(url_)
-                .arg(elided_text)
-                );
+        label_text.append(QString("<a href=\"%1\">%2</a>").arg(url_, elided_text));
     } else {
         label_text += elided_text;
     }

ui/qt/widgets/elided_label.h

@@ -17,7 +17,15 @@ class ElidedLabel : public QLabel
     Q_OBJECT
 public:
     explicit ElidedLabel(QWidget *parent = 0);
+    /**
+     * @brief setUrl Set the label's URL.
+     * @param url The URL to set.
+     */
     void setUrl(const QString &url);
+    /**
+     * @brief setSmallText Specifies a small or normal text size.
+     * @param small_text Show the text in a smaller font size if true, or a normal size otherwise.
+     */
     void setSmallText(bool small_text = true) { small_text_ = small_text; }
 
 protected:
@@ -34,6 +42,9 @@ private:
 signals:
 
 public slots:
+    /**
+     * @brief clear Clear the label.
+     */
     void clear();
     void setText(const QString &text);
 };