huggingface: Added a missing argument to a ChatHuggingFace doc notebook. (#24929)

- **Description:** When adding docs for constructing ChatHuggingFace
using a HuggingFacePipeline, I forgot to add `return_full_text=False` as
an argument. In this setup, the chat response would incorrectly contain
all the input text. I am fixing that here by adding that line to the
offending notebook.

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>

docs/docs/integrations/chat/huggingface.ipynb

@@ -129,6 +129,7 @@
     "        max_new_tokens=512,\n",
     "        do_sample=False,\n",
     "        repetition_penalty=1.03,\n",
+    "        return_full_text=False,\n",
     "    ),\n",
     ")"
    ]