[releng] Tweak wording of unstable release reminder

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 9a552944faa131064c48c65940708de1975cf4d2
Author: Michael Catanzaro <mcatanzaro redhat com>
Date:   Mon Mar 21 11:42:43 2022 -0500

    Tweak wording of unstable release reminder

 tools/schedule/libschedule.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tools/schedule/libschedule.py b/tools/schedule/libschedule.py
index b970fcf..87227dd 100755
--- a/tools/schedule/libschedule.py
+++ b/tools/schedule/libschedule.py
@@ -43,7 +43,7 @@ handle the release for you.""",
             "description_template": """Tarballs are due on $date before 23:59 UTC for the GNOME
 $version $detail release, which will be delivered next week. In order to
 ensure adequate testing, core modules should try to release according to
-the unstable schedule if they have significant changes.
+the unstable schedule if they have nontrivial changes.
 
 Please make sure that your tarballs will be uploaded before Saturday 23:59
 UTC. Tarballs uploaded later than that will probably be too late.""",