[Initiatives.wiki] Update Update App Screenshots

[Sophie Herold <sophieherold src gnome org>]

commit 07159784ab2743bf20330bd9deac1b7beff24ac5
Author: Sophie Herold <sophie hemio de>
Date:   Sat Feb 19 01:01:17 2022 +0000

    Update Update App Screenshots

 Update-App-Screenshots.md | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/Update-App-Screenshots.md b/Update-App-Screenshots.md
index aefa10f..e308022 100644
--- a/Update-App-Screenshots.md
+++ b/Update-App-Screenshots.md
@@ -11,5 +11,7 @@
 #### Avoid
 - Using a non-standard system stylesheet or icons
 - Using non-standard window decorations (e.g. minimize/maximize enabled)
+- Adding text to the screenshot
+- Manually manipulating the screenshot
 
 [Appstream 
documentation](https://www.freedesktop.org/software/appstream/docs/chap-Metadata.html#tag-screenshots)
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