[Initiatives.wiki] Update Update App Screenshots

[Sophie Herold <sophieherold src gnome org>]

commit 4c78d3cc14244dc17ddfae179258fbbacc26edbe
Author: Sophie Herold <sophie hemio de>
Date:   Thu Feb 24 16:53:55 2022 +0000

    Update Update App Screenshots

 Update-App-Screenshots.md | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/Update-App-Screenshots.md b/Update-App-Screenshots.md
index 4003c2c..ea6a30e 100644
--- a/Update-App-Screenshots.md
+++ b/Update-App-Screenshots.md
@@ -7,6 +7,7 @@
 - Show off the app with realistic and good-looking example content
 - Use GNOME system defaults (stylesheet, font, icons, window decorations, etc.)
 - Store the screenshots inside the projects git repository
+- Do not use `width` and `height` argument for the `<image>` tag
 - Update screenshots when the app UI changes
 
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