runtime(doc): correct `vi` registers 1-9 documentation error

When using heirloom `vi` originally written by Bill Joy (`:version`
gives me "Version 4.0 (gritter) 12/25/06"), its possible to store text into
registers 1-9 and subsequently use the `:edit` or `:next` command to
change files and paste the contents of those numbered registers,
contrary to what Vim documentation states.

POSIX description also does not mention such a restriction:
https://pubs.opengroup.org/onlinepubs/9799919799/utilities/ex.html#tag_20_40_13_10

closes: #15814

Signed-off-by: Frederick Key Abell III <fkabell@localhost.localdomain>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/change.txt b/runtime/doc/change.txt
index 2304712..785f4ac 100644
--- a/runtime/doc/change.txt
+++ b/runtime/doc/change.txt
@@ -1,4 +1,4 @@
-*change.txt*    For Vim version 9.1.  Last change: 2024 Jul 28
+*change.txt*    For Vim version 9.1.  Last change: 2024 Oct 07
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1283,8 +1283,7 @@
    With each successive deletion or change, Vim shifts the previous contents
 of register 1 into register 2, 2 into 3, and so forth, losing the previous
 contents of register 9.
-{Vi: numbered register contents are lost when changing files; register 0 does
-not exist}
+{Vi: register 0 does not exist}
 
 3. Small delete register "-				*quote_-* *quote-*
 This register contains text from commands that delete less than one line,