docs: Update documentation and Doxygen documentation generation
diff --git a/helper/ndn-face-container.h b/helper/ndn-face-container.h
index 692daf6..e1566e6 100644
--- a/helper/ndn-face-container.h
+++ b/helper/ndn-face-container.h
@@ -32,7 +32,7 @@
 namespace ndn {
 
 /**
- * \ingroup ndn-helpers
+ * @ingroup ndn-helpers
  * \brief A pool for Ndn faces
  * 
  * Provides tools to perform basic manipulation on faces, such as