update typos (google#432)

Author: singhniraj08

site/en/gemini-api/tutorials/extract_structured_data.ipynb

@@ -260,7 +260,7 @@
       },
       "outputs": [],
       "source": [
-        "model = model = model = genai.GenerativeModel(\n",
+        "model = genai.GenerativeModel(\n",
         "    model_name='models/gemini-1.5-pro-latest')\n",
         "\n",
         "response = model.generate_content(\n",