[PATCH] notes: update documentation for `use_default_notes`

[Kristoffer Haugsbakk <code@khaugsbakk.name>]

`suppress_default_notes` was renamed to `use_default_notes` in
3a03cf6b1d (notes: refactor display notes default handling,
2011-03-29).

The commit message says that “values less than one [indicates] “not
set” ”, but I think what was meant was “less than zero”.

Signed-off-by: Kristoffer Haugsbakk <code@khaugsbakk.name>
---

Notes (series):
    See also: https://lore.kernel.org/git/cover.1685441207.git.code@khaugsbakk.name
    
    Found while working on that. But this change could be posted
    separately.

 notes.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/notes.h b/notes.h
index c1682c39a9..69b6120146 100644
--- a/notes.h
+++ b/notes.h
@@ -286,8 +286,9 @@ void disable_display_notes(struct display_notes_opt *opt, int *show_notes);
  * If 'opt' is not NULL, then it specifies additional settings for the
  * displaying:
  *
- * - suppress_default_notes indicates that the notes from
- *   core.notesRef and notes.displayRef should not be loaded.
+ * - use_default_notes: less than `0` is "unset", which means that the
+ *   deafult refs are show iff no other notes are given. Else treat like
+ *   a boolean.
  *
  * - extra_notes_refs may contain a list of globs (in the same style
  *   as notes.displayRef) where notes should be loaded from.
-- 
2.41.0.rc2