doc: fill-buf return value wrongly described.

* txr.1: The fill-buf function returns the position
after the last byte that was read, not the position of
that that last byte.

1 files changed, 2 insertions, 1 deletions

diff --git a/txr.1 b/txr.1
index 1461062d..9da947e5 100644
--- a/txr.1
+++ b/txr.1
@@ -24916,7 +24916,8 @@ do not support
 
 The
 .code fill-buf
-function returns the position of the last byte that was successfully read.
+function returns the position that is one byte past the last byte that
+was successfully read.
 If an end-of-file or other error condition occurs before the buffer is filled
 through to the end, then the value returned is smaller than the buffer length.
 In this case, the area of the buffer beyond the read size retains its previous