docs: fix capitalization in doxygen comments

Change-Id: Ibf5ee5119d12d60d382b0acef8dfd08277c18fcb
diff --git a/tests/daemon/mgmt/face-manager.t.cpp b/tests/daemon/mgmt/face-manager.t.cpp
index 794c363..140b1c6 100644
--- a/tests/daemon/mgmt/face-manager.t.cpp
+++ b/tests/daemon/mgmt/face-manager.t.cpp
@@ -60,7 +60,7 @@
     RANDOMIZE_COUNTERS       = 1 << 3,
   };
 
-  /** \brief adds a face to the FaceTable
+  /** \brief Adds a face to the FaceTable.
    *  \param options bitwise OR'ed AddFaceFlags
    */
   shared_ptr<Face>