[Docs] Add video section (#28958)

Add video section

docs/source/en/_toctree.yml

@@ -587,14 +587,10 @@
         title: Swin2SR
       - local: model_doc/table-transformer
         title: Table Transformer
-      - local: model_doc/timesformer
-        title: TimeSformer
       - local: model_doc/upernet
         title: UperNet
       - local: model_doc/van
         title: VAN
-      - local: model_doc/videomae
-        title: VideoMAE
       - local: model_doc/vit
         title: Vision Transformer (ViT)
       - local: model_doc/vit_hybrid
@@ -607,8 +603,6 @@
         title: ViTMatte
       - local: model_doc/vit_msn
         title: ViTMSN
-      - local: model_doc/vivit
-        title: ViViT
       - local: model_doc/yolos
         title: YOLOS
       title: Vision models
@@ -671,6 +665,15 @@
       - local: model_doc/xlsr_wav2vec2
         title: XLSR-Wav2Vec2
       title: Audio models
+    - isExpanded: false
+      sections:
+      - local: model_doc/timesformer
+        title: TimeSformer
+      - local: model_doc/videomae
+        title: VideoMAE
+      - local: model_doc/vivit
+        title: ViViT
+      title: Video models 
     - isExpanded: false
       sections:
       - local: model_doc/align