[Doc] add opendatalab download link

[jorie-peng]

add opendatalab download link in dataset_prepare docs, including:

• docs/en/user_guides/data_prepare/dataset_preparer.md
• docs/en/user_guides/data_prepare/det.md
• docs/en/user_guides/data_prepare/recog.md
• docs/zh_cn/user_guides/data_prepare/dataset_preparer.md
• docs/zh_cn/user_guides/data_prepare/det.md
• docs/zh_cn/user_guides/data_prepare/recog.md

[CLAassistant]

All committers have signed the CLA.

[gaotongxiao]

Thanks for your contribution! The linting test seems not passed.

You can install pre-commit hooks to automatically fix this issue:

pip install -U pre-commit
pre-commit install
pre-commit run --all-files
git add --update
git commit

did not pass linting test

[jorie-peng]

Thanks for your contribution! The linting test seems not passed.

You can install pre-commit hooks to automatically fix this issue:

pip install -U pre-commit
pre-commit install
pre-commit run --all-files
git add --update
git commit

Thanks for your help. I have checked it and push it again!

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (47f5430) 89.89% compared to head (9039a5b) 89.89%.

❗ Current head 9039a5b differs from pull request most recent head a29dcb7. Consider uploading reports for the commit a29dcb7 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           dev-1.x    #1753   +/-   ##
========================================
  Coverage    89.89%   89.89%           
========================================
  Files          191      191           
  Lines        11197    11197           
  Branches      1578     1578           
========================================
  Hits         10065    10065           
  Misses         821      821           
  Partials       311      311           

Flag	Coverage Δ
unittests	89.89% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[jason102811]

Hi @jorie-peng ！First of all, we want to express our gratitude for your significant PR in the MMOCR . Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

We would also like to invite you to join our Special Interest Group (SIG) private channel on Discord, where you can share your experiences, ideas, and build connections with like-minded peers. To join the SIG channel, simply message moderator— OpenMMLab on Discord or briefly share your open-source contributions in the #introductions channel and we will assist you. Look forward to seeing you there! Join us ：https://discord.gg/UjgXkPWNqA

If you have WeChat account，welcome to join our community on WeChat. You can add our assistant ：openmmlabwx. Please add "mmsig + Github ID" as a remark when adding friends：）
Thank you again for your contribution❤