security: Add doxygen comments

Change-Id: Ieafe4d13513e626d84ef9e621694f69844785018
diff --git a/src/security/sec-public-info-sqlite3.cpp b/src/security/sec-public-info-sqlite3.cpp
index bc16d9d..fbef713 100644
--- a/src/security/sec-public-info-sqlite3.cpp
+++ b/src/security/sec-public-info-sqlite3.cpp
@@ -30,8 +30,7 @@
 
 using namespace std;
 
-namespace ndn
-{
+namespace ndn {
 
 static const string INIT_ID_TABLE = "\
 CREATE TABLE IF NOT EXISTS                                           \n \