fix: update installation instructions for the merger module to ensure proper uninstallation and reinstallation

zhch/universal_doc_parser/模型统一框架.md

@@ -236,7 +236,7 @@ output:
 cd /Users/zhch158/workspace/repository.git/ocr_verify
 
 # 2. 安装 merger 模块(可编辑模式)
-python3 -m pip install -e merger/
+pip uninstall -y merger && pip install -e .
 
 # 3. 验证安装
 python3 -c "from merger.table_cell_matcher import TableCellMatcher; print('✅ 安装成功')"