Switch to std::filesystem

Change-Id: I3b8e8adfae9b063f97396d35a5f2296df56a3eb9
diff --git a/daemon/face/unix-stream-channel.hpp b/daemon/face/unix-stream-channel.hpp
index dbe53d4..d99ea33 100644
--- a/daemon/face/unix-stream-channel.hpp
+++ b/daemon/face/unix-stream-channel.hpp
@@ -80,7 +80,7 @@
    *                       returns an error)
    * \param backlog        The maximum length of the queue of pending incoming
    *                       connections
-   * \throw boost::system::system_error
+   * \throw std::system_error
    */
   void
   listen(const FaceCreatedCallback& onFaceCreated,