Clang: Add links to web pages in Clang-Tidy configuration

Each Clang-Tidy check get the separate link except
clang-analyzer which has only a whole group page.

Change-Id: I0b63cce8475109812280d9d44ac2d36aaa66e03b
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cpptools/clangdiagnosticconfigswidget.h

@@ -73,6 +73,7 @@ private:
     void onRemoveButtonClicked();
     void onClangTidyModeChanged(int index);
     void onClangTidyTreeChanged();
+    void onClangTidyTreeItemClicked(const QModelIndex &index);
     void onClazyRadioButtonChanged(bool checked);
 
     void onDiagnosticOptionsEdited();