docs: wrote Doxygen comments for all files

refs: #4118

Change-Id: Ib0e7f1926cdabcca5aa401b59b24519412a099f7
diff --git a/src/conf-file-processor.cpp b/src/conf-file-processor.cpp
index c80f439..e48158c 100644
--- a/src/conf-file-processor.cpp
+++ b/src/conf-file-processor.cpp
@@ -19,8 +19,8 @@
  * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  **/
 
-#include "conf-parameter.hpp"
 #include "conf-file-processor.hpp"
+#include "conf-parameter.hpp"
 #include "adjacent.hpp"
 #include "utility/name-helper.hpp"
 #include "update/prefix-update-processor.hpp"