GTK4 documentation references gtk3-Resource-Files
It was found in docs/reference/gtk/glossary.xml
. It looks like gtk3-Resource-Files
has been removed in commit 0df38805, so it is unexpected for the documentation to reference it.
<glossentry id="style">
<glossterm>style</glossterm>
<glossdef>
<para>
A style encapsulates what GTK needs to know in order to draw
a widget. Styles can be modified with
<link linkend="gtk3-Resource-Files">resource files</link>.
</para>
</glossdef>
</glossentry>