Update image.md: fix inconsistent API

[kuonangzhe]

Update old crop_img to imcrop, pad_img to impad

[codecov]

Codecov Report

Merging #19 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #19   +/-   ##
=======================================
  Coverage   41.11%   41.11%           
=======================================
  Files          67       67           
  Lines        2486     2486           
=======================================
  Hits         1022     1022           
  Misses       1464     1464

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update da39212...7d35b4d. Read the comment docs.

[hellock]

Thanks for revising the typo in the documentation.

[kuonangzhe]

Yep! My pleasure~

[OpenMMLab-Assistant001]

Hi @kuonangzhe！

First of all, we want to express our gratitude for your significant PR in the mmcv project. 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/raweFPmdzG

If you have WeChat，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❤