(now that we moved to libevent)
/** Try to flush more bytes onto <b>conn</b>-\>s.
*
- * This function gets called either from conn_write() in main.c
- * when poll() has declared that conn wants to write, or below
+ * This function gets called either from conn_write_callback() in main.c
+ * when libevent tells us that conn wants to write, or below
* from connection_write_to_buf() when an entire TLS record is ready.
*
* Update <b>conn</b>-\>timestamp_lastwritten to now, and call flush_buf