Update the-first-extension.md

[baoyachi]

Fix unknown link exceptions

[mortalYoung]

相关内容的英文部分也一起修改一下吧。位置是：website/docs/the-first-extension.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.92%. Comparing base (a114a2a) to head (3cd4045).

❗ Current head 3cd4045 differs from pull request most recent head 72f0c3c

Please upload reports for the commit 72f0c3c to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #892   +/-   ##
=======================================
  Coverage   90.92%   90.92%           
=======================================
  Files         188      188           
  Lines        6093     6093           
  Branches     1467     1467           
=======================================
  Hits         5540     5540           
  Misses        547      547           
  Partials        6        6           

Flag	Coverage Δ
integration	90.92% <ø> (ø)
unittests	90.92% <ø> (ø)

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mortalYoung]

+1