runtime(doc): update vi_diff.txt: add default value for 'flash'

The "flash" option was added relatively late and seems to be exclusive
to System V. (It's not in 4.4BSD and it's not in V8 UNIX, checked [on
TUHS](https://www.tuhs.org/cgi-bin/utree.pl).) The oldest occurrence of
`flash` in "a vi" I could find is in SysV R2 for the VAX, where it
[defaults to
1](https://github.com/ryanwoodsmall/oldsysv/blob/master/sysvr2-vax/src/cmd/vi/vax/ex_data.c)
= on.

closes: #14778

Signed-off-by: Cthulhux <github@tuxproject.de>
Signed-off-by: Christian Brabandt <cb@256bit.org>

diff --git a/runtime/doc/vi_diff.txt b/runtime/doc/vi_diff.txt
index 1714833c83ca097b51a02f912991c0073063c0d5..3bcee472ab0b4d3c39a6acbdeebe23347fa43ba4 100644 (file)
--- a/runtime/doc/vi_diff.txt
+++ b/runtime/doc/vi_diff.txt
@@ -1,4 +1,4 @@
-*vi_diff.txt*   For Vim version 9.1.  Last change: 2022 Apr 03
+*vi_diff.txt*   For Vim version 9.1.  Last change: 2024 May 15
 
 
                  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -49,7 +49,7 @@ printed.
 
 autoprint (ap)         boolean (default on)            *'autoprint'* *'ap'*
 beautify (bf)          boolean (default off)           *'beautify'* *'bf'*
-flash (fl)             boolean (default ??)            *'flash'* *'fl'*
+flash (fl)             boolean (default on)            *'flash'* *'fl'*
 graphic (gr)           boolean (default off)           *'graphic'* *'gr'*
 hardtabs (ht)          number  (default 8)             *'hardtabs'* *'ht'*
        number of spaces that a <Tab> moves on the display