fixup! Update sys/include/net/nanocoap.h

sys/include/net/nanocoap.h

@@ -2061,9 +2061,9 @@ ssize_t coap_build_hdr(coap_hdr_t *hdr, unsigned type, const void *token,
  * will create the reply packet header based on parameters from the request
  * (e.g., id, token).
  *
- * Passing a non-zero @p data_len will ensure the remaining data fits into the
- * buffer along with the header. For this validation, data_len must include
- * any CoAP Options, the payload marker, as well as the payload proper.
+ * Passing a non-zero @p max_data_len will ensure the remaining data fits into
+ * the buffer along with the header. For this validation, @p max_data_len must
+ * include any CoAP Options, the payload marker, as well as the payload proper.
  *
  * @param[in]   pkt             packet to reply to
  * @param[in]   code            reply code (e.g., COAP_CODE_204)
@@ -2075,7 +2075,8 @@ ssize_t coap_build_hdr(coap_hdr_t *hdr, unsigned type, const void *token,
  *              No-Response option there is only an empty ACK to be sent back.
  *              The caller may just continue populating the payload (the space
  *              was checked to suffice), but may also skip that needless step
- *              if the returned length is less than the requested @p data_length.
+ *              if the returned length is less than the requested @p
+ *              max_data_length.
  *
  * @return      @p max_data_len + size of the header written in bytes
  *