Fix a link issue in Japanese document

[risto24]

Summary

Fix missing bracket for JP document.

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[seratch]

Hi @risto24, thanks for fixing this issue! Once the CI builds pass, we'll merge your contribution 🎉

[codecov]

Codecov Report

Merging #1111 (a2dad52) into main (72b28a7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1111   +/-   ##
=======================================
  Coverage   69.31%   69.31%           
=======================================
  Files          13       13           
  Lines        1284     1284           
  Branches      380      380           
=======================================
  Hits          890      890           
  Misses        320      320           
  Partials       74       74           

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