fix pipeline doc and update visual rst (#4050)

docs/module_usage/tutorials/ocr_modules/formula_recognition.en.md

@@ -153,7 +153,7 @@ The meanings of the running results parameters are as follows:
 
 The visualization image is as follows:
 
-<img src="https://raw.githubusercontent.com/cuicheng01/PaddleX_doc_images/refs/heads/main/images/modules/formula_recog/general_formula_rec_001_res.png">
+<img src="https://raw.githubusercontent.com/cuicheng01/PaddleX_doc_images/refs/heads/main/images/modules/formula_recog/general_formula_rec_001_res_paddleocr3.png">
 
 <b>Note: If you need to visualize the formula recognition pipeline, you need to run the following commands to install the LaTeX rendering environment. Currently, the formula recognition visualization pipeline only supports the Ubuntu environment; other environments are not supported at this time. For complex formulas, the LaTeX results may include some advanced representations that might not be displayed successfully in environments like Markdown:</b>
 ```bash

docs/module_usage/tutorials/ocr_modules/formula_recognition.md

@@ -150,7 +150,7 @@ for res in output:
 
 可视化图片如下，左侧是待预测的公式图像，右边是预测的结果渲染后的公式图像：
 
-<img src="https://raw.githubusercontent.com/cuicheng01/PaddleX_doc_images/refs/heads/main/images/modules/formula_recog/general_formula_rec_001_res.png">
+<img src="https://raw.githubusercontent.com/cuicheng01/PaddleX_doc_images/refs/heads/main/images/modules/formula_recog/general_formula_rec_001_res_paddleocr3.png">
 
 <b> 注：如果您需要对公式识别产线进行可视化，需要运行如下命令来对LaTeX渲染环境进行安装。目前公式识别产线可视化只支持Ubuntu环境，其他环境暂不支持。对于复杂公式，LaTeX 结果可能包含部分高级的表示，Markdown等环境中未必可以成功显示：</b>
 ```bash