[`HfQuantizer`] Move it to "Developper guides" (#28768)

Update _toctree.yml

docs/source/en/_toctree.yml

@@ -131,14 +131,14 @@
     title: Custom Tools and Prompts
   - local: troubleshooting
     title: Troubleshoot  
+  - local: hf_quantizer
+    title: Contribute new quantization method
   title: Developer guides
 - sections:
   - local: performance
     title: Overview
   - local: quantization
     title: Quantization
-  - local: hf_quantizer
-    title: Contribute new quantization method
   - sections:
     - local: perf_train_gpu_one
       title: Methods and tools for efficient training on a single GPU