[Chameleon, Hiera] Improve docs (#32038)

* Improve docs

* Fix docs

* Fix code snippet

docs/source/en/_toctree.yml

@@ -326,8 +326,6 @@
         title: CamemBERT
       - local: model_doc/canine
         title: CANINE
-      - local: model_doc/chameleon
-        title: chameleon
       - local: model_doc/codegen
         title: CodeGen
       - local: model_doc/code_llama
@@ -760,6 +758,8 @@
         title: BridgeTower
       - local: model_doc/bros
         title: BROS
+      - local: model_doc/chameleon
+        title: chameleon
       - local: model_doc/chinese_clip
         title: Chinese-CLIP
       - local: model_doc/clip