Fixed weird comment fmt

tls/s2n_handshake_io.c

@@ -1592,7 +1592,7 @@ static int s2n_handle_retry_state(struct s2n_connection *conn)
 bool s2n_handshake_is_complete(struct s2n_connection *conn)
 {
     /* A deserialized connection implies that the handshake is complete because
-    /* connections cannot be serialized before completing the handshake. */
+     * connections cannot be serialized before completing the handshake. */
     return conn && (ACTIVE_STATE(conn).writer == 'B' || conn->deserialized_conn);
 }