Apply suggestions from code review

Co-authored-by: Mathieu Pellerin <nirvn.asia@gmail.com>

src/gui/settings/qgssettingstreemodel.h

@@ -64,10 +64,10 @@ class GUI_EXPORT QgsSettingsTreeModelNodeData : public QObject
     void applyChanges();
 
     //! Returns if the node is the root node
-    bool isRoot() const {return mParent == nullptr;}
+    bool isRoot() const { return mParent == nullptr; }
 
     //! Returns the dynamic key parts of the named list parent tree nodes
-    QStringList namedParentNodes() const {return mNamedParentNodes;}
+    QStringList namedParentNodes() const { return mNamedParentNodes; }
 
     //! Returns the children nodes of the node (setting or tree node)
     QList<QgsSettingsTreeModelNodeData *> children() const {return mChildren;}
@@ -87,7 +87,7 @@ class GUI_EXPORT QgsSettingsTreeModelNodeData : public QObject
     //! Returns the value of the node (setting or tree node)
     QVariant originalValue() const {return mOriginalValue;}
 
-    //! Sets the value of the setting node
+    //! Sets the \a value of the setting node
     bool setValue( const QVariant &value );
 
     //! Returns if the setting exists (value is set)
@@ -97,8 +97,8 @@ class GUI_EXPORT QgsSettingsTreeModelNodeData : public QObject
     bool isEdited() const {return mIsEdited;}
 
     /**
-     * Returns the setting of the node
-     * It returns a nullptr if the setting does not exist
+     * Returns a pointer to the setting of the node or NULLPTR if the
+     * setting does not exist.
      */
     const QgsSettingsEntryBase *setting() const {return mSetting;}
 
@@ -185,7 +185,7 @@ class GUI_EXPORT QgsSettingsTreeModel : public QAbstractItemModel
     void applyChanges();
 
     /**
-     * Returns settings tree node for given index. Returns root node for invalid index.
+     * Returns settings tree node for given \a index or the root node if the index is invalid.
      */
     QgsSettingsTreeModelNodeData *index2node( const QModelIndex &index ) const SIP_SKIP;