This typo is in a code comment so not end-user visible.
/* This function is called from the session handler which detects the end of
* handshake, in order to complete initialization of a valid stream. It must be
- * called with a completley initialized session. It returns the pointer to
+ * called with a completely initialized session. It returns the pointer to
* the newly created stream, or NULL in case of fatal error. The client-facing
* end point is assigned to <origin>, which must be valid. The stream's task
* is configured with a nice value inherited from the listener's nice if any.