docs: wrote Doxygen comments for all files

refs: #4118

Change-Id: Ib0e7f1926cdabcca5aa401b59b24519412a099f7
diff --git a/src/route/nexthop-list.hpp b/src/route/nexthop-list.hpp
index 918cab2..b35f3bf 100644
--- a/src/route/nexthop-list.hpp
+++ b/src/route/nexthop-list.hpp
@@ -17,18 +17,19 @@
  * You should have received a copy of the GNU General Public License along with
  * NLSR, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
  **/
+
 #ifndef NLSR_NEXTHOP_LIST_HPP
 #define NLSR_NEXTHOP_LIST_HPP
 
+#include "nexthop.hpp"
+#include "adjacent.hpp"
+
 #include <set>
 #include <iostream>
 #include <boost/cstdint.hpp>
 
 #include <ndn-cxx/face.hpp>
 
-#include "nexthop.hpp"
-#include "adjacent.hpp"
-
 namespace nlsr {
 
 struct NextHopComparator {
@@ -144,4 +145,4 @@
 
 } // namespace nlsr
 
-#endif //NLSR_NEXTHOP_LIST_HPP
+#endif // NLSR_NEXTHOP_LIST_HPP