* Useful functions for querying the state of BIO pair endpoints:
*
* BIO_ctrl_pending(bio) number of bytes we can read now
- * BIO_ctrl_get_read_request(bio) number of bytes needed to fulfil
+ * BIO_ctrl_get_read_request(bio) number of bytes needed to fulfill
* other side's read attempt
* BIO_ctrl_get_write_guarantee(bio) number of bytes we can write now
*