move "merge annotation with fallback" in docs

docs/volume_annotation/import_export.md

@@ -6,3 +6,11 @@ To import a volume annotation, ensure it is in the correct format (WKW or Zarr)
 To export (download) an annotation, go to **Menu > Download**. From there, select the data you want to download and choose the desired format (WKW, Zarr). Alternatively, you can open your annotation dashboard and click **Download** next to the annotation.
 
 ![youtube-video](https://www.youtube.com/embed/l8ZacNqvMzI)
+
+## Merging volume annotation with fallback data
+
+After finishing the annotation of a volume layer with a fallback layer, the combined state of these layers can be materialized into a new dataset. For this, go to the layer settings in the left border tab. On the top right of the volume layer is the following button:
+
+![Icon to open the materialize volume annotation modal](../images/materialize_volume_annotation_icon.jpg)
+
+This button opens up a modal that starts a long-running job which will materialize the volume annotation.

docs/volume_annotation/index.md

@@ -10,11 +10,3 @@ WEBKNOSSOS supports volume/segmentation annotations. This annotation type lets y
 
 Watch this tutorial to get started: 
 ![youtube-video](https://www.youtube.com/embed/iw2C7XB6wP4?start=120)
-
-## Merging volume annotation with fallback data
-
-After finishing the annotation of a volume layer with a fallback layer, the combined state of these layers can be materialized into a new dataset. For this, go to the layer settings in the left border tab. On the top right of the volume layer is the following button:
-
-![Icon to open the materialize volume annotation modal](../images/materialize_volume_annotation_icon.jpg)
-
-This button opens up a modal that starts a long-running job which will materialize the volume annotation.