Docs: Use Doxygen \todo comments (#6421)

* format todo comments for doxygen

* Mention Todo List & link search

servatrice/src/serversocketinterface.cpp

@@ -1207,7 +1207,7 @@ Response::ResponseCode AbstractServerSocketInterface::cmdRegisterAccount(const C
         return Response::RespEmailBlackListed;
     }
 
-    // TODO: Move this method outside of the db interface
+    //! \todo Move this method outside of the db interface
     QString errorString;
     if (!sqlInterface->usernameIsValid(userName, errorString)) {
         if (servatrice->getEnableRegistrationAudit())
@@ -1330,7 +1330,7 @@ Response::ResponseCode AbstractServerSocketInterface::cmdRegisterAccount(const C
 
 bool AbstractServerSocketInterface::tooManyRegistrationAttempts(const QString &ipAddress)
 {
-    // TODO: implement
+    //! \todo implement
     Q_UNUSED(ipAddress);
     return false;
 }

servatrice/src/smtp/qxtmailmessage.cpp

@@ -27,9 +27,8 @@
  * \class QxtMailMessage
  * \inmodule QxtNetwork
  * \brief The QxtMailMessage class encapsulates an e-mail according to RFC 2822 and related specifications
- * TODO: {implicitshared}
  */
-
+//! \todo {implicitshared}
 #include "qxtmailmessage.h"
 
 #include "qxtmail_p.h"