docs: Removed unwanted cell in refine segment (langchain-ai#22604)

**Description:**
There is one unwanted duplicate cell in refine section of summarization
documentation, i have removed it.

docs/docs/tutorials/summarization.ipynb

@@ -558,51 +558,6 @@
     "It's also possible to supply a prompt and return intermediate steps."
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": 22,
-   "id": "cc931bde-8258-4d10-8479-f2d2d69f49f4",
-   "metadata": {},
-   "outputs": [
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "/Users/chestercurme/repos/langchain/libs/core/langchain_core/_api/deprecation.py:119: LangChainDeprecationWarning: The method `Chain.__call__` was deprecated in langchain 0.1.0 and will be removed in 0.2.0. Use invoke instead.\n",
-      "  warn_deprecated(\n"
-     ]
-    }
-   ],
-   "source": [
-    "prompt_template = \"\"\"Write a concise summary of the following:\n",
-    "{text}\n",
-    "CONCISE SUMMARY:\"\"\"\n",
-    "prompt = PromptTemplate.from_template(prompt_template)\n",
-    "\n",
-    "refine_template = (\n",
-    "    \"Your job is to produce a final summary\\n\"\n",
-    "    \"We have provided an existing summary up to a certain point: {existing_answer}\\n\"\n",
-    "    \"We have the opportunity to refine the existing summary\"\n",
-    "    \"(only if needed) with some more context below.\\n\"\n",
-    "    \"------------\\n\"\n",
-    "    \"{text}\\n\"\n",
-    "    \"------------\\n\"\n",
-    "    \"Given the new context, refine the original summary in Italian\"\n",
-    "    \"If the context isn't useful, return the original summary.\"\n",
-    ")\n",
-    "refine_prompt = PromptTemplate.from_template(refine_template)\n",
-    "chain = load_summarize_chain(\n",
-    "    llm=llm,\n",
-    "    chain_type=\"refine\",\n",
-    "    question_prompt=prompt,\n",
-    "    refine_prompt=refine_prompt,\n",
-    "    return_intermediate_steps=True,\n",
-    "    input_key=\"input_documents\",\n",
-    "    output_key=\"output_text\",\n",
-    ")\n",
-    "result = chain({\"input_documents\": split_docs}, return_only_outputs=True)"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": 14,