improve some instruction for using exsiting OCR result

Author: chienyuanchang

notebooks/field_extraction_pro_mode.ipynb

@@ -171,6 +171,9 @@
     "REFERENCE_DOC_SAS_URL = os.getenv(\"REFERENCE_DOC_SAS_URL\")\n",
     "REFERENCE_DOC_PATH = os.getenv(\"REFERENCE_DOC_PATH\")\n",
     "\n",
+    "# Set skip_analyze to True if you already have OCR results for the documents in the reference_docs folder\n",
+    "# Please name the OCR result files with the same name as the original document files including its extension, and add the suffix \".result.json\"\n",
+    "# For example, if the original document is \"invoice.pdf\", the OCR result file should be named \"invoice.pdf.result.json\"\n",
     "await client.generate_knowledge_base_on_blob(reference_docs, REFERENCE_DOC_SAS_URL, REFERENCE_DOC_PATH, skip_analyze=False)"
    ]
   },