docs: fix capitalization in doxygen comments

Change-Id: Ibf5ee5119d12d60d382b0acef8dfd08277c18fcb
diff --git a/tests/daemon/fw/forwarding-hint.t.cpp b/tests/daemon/fw/forwarding-hint.t.cpp
index ce7c414..46e75f0 100644
--- a/tests/daemon/fw/forwarding-hint.t.cpp
+++ b/tests/daemon/fw/forwarding-hint.t.cpp
@@ -102,7 +102,7 @@
     topo.registerPrefix(nodeS, linkSQ->getFace(nodeS), "/net/ndnsim", 10);
   }
 
-  /** \brief express an Interest with Link object from consumerA
+  /** \brief Express an Interest with Link object from consumerA.
    */
   void
   consumerExpressInterest(int seq)