Fix malformed markdown links in PaddleOCR-VL SFT documentation

[kimchi-developer]

Summary

• Fixed four markdown links that had double parentheses ((link)) instead of single parentheses (link)
• This was causing the links to not render properly in the documentation

Changes

• Line 52: Fixed ERNIEKit Installation Guide link
• Line 65: Fixed SFT VL Dataset Format link
• Line 78: Fixed Bengali training dataset download link
• Line 197: Fixed Bengali test dataset download link

Test plan

• [x] Verified all links now have correct markdown syntax
• [ ] Review the rendered markdown to ensure links display correctly

🤖 Generated with Claude Code

[paddle-bot[bot]]

Thanks for your contribution!

[CLAassistant]

All committers have signed the CLA.