Update doc

lib/includes/nghttp2/nghttp2.h

@@ -472,9 +472,9 @@ NGHTTP2_EXTERN nghttp2_vec nghttp2_rcbuf_get_buf(nghttp2_rcbuf *rcbuf);
 /**
  * @function
  *
- * Returns 1 if the underlying buffer is statically allocated,
- * and 0 otherwise. This can be useful for language bindings that wish to avoid
- * creating duplicate strings for these buffers.
+ * Returns nonzero if the underlying buffer is statically allocated,
+ * and 0 otherwise. This can be useful for language bindings that wish
+ * to avoid creating duplicate strings for these buffers.
  */
 NGHTTP2_EXTERN int nghttp2_rcbuf_is_static(const nghttp2_rcbuf *rcbuf);