* cosmetic / minor

lib/mu-str.h

@@ -30,6 +30,10 @@
 
 G_BEGIN_DECLS
 
+/**
+ * @addtogroup MuStr
+ * @{
+ */
 
 /**
  * create a 'display contact' from an email header To/Cc/Bcc/From-type address
@@ -329,6 +333,8 @@ const gchar* mu_str_subject_normalize (const gchar* str);
  */
 gchar* mu_str_quoted_from_strv (const gchar **params);
 
+/** @} */
+
 G_END_DECLS
 
 #endif /*__MU_STR_H__*/