docs/guide-ja/* updated

[softark]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	Japanese Guide documents updated

[what-the-diff]

PR Summary

• Added a New File: Rest-filtering-collections.md
  A new documentation file has been added to provide instructions for filtering collections.

• Documentation Cleanup
  Several typos and errors identified across various documentation files have been fixed. These edits improve the readability and accuracy of the provided guidance.

• Fixed Broken Links
  A number of broken references to external resources within the documentation were spotted and corrected. This ensures that all links included in the doc now point to the proper destinations, enhancing usability and user experience.

• Updated Testing Documentation
  Specific updates pertaining to testing were made, particularly for using fixtures with Codeception and functional testing implementations. This will provide clearer instructions for running and writing tests.

• Modified Rest-resources.md
  A paragraph on filtering collections was removed from the rest-resources.md file, avoiding repetition since we now have a new file rest-filtering-collections.md dedicated to this topic.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fcaafd8) 47.56% compared to head (a94fda2) 48.02%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20088      +/-   ##
==========================================
+ Coverage   47.56%   48.02%   +0.45%     
==========================================
  Files         445      445              
  Lines       43408    43890     +482     
==========================================
+ Hits        20648    21078     +430     
- Misses      22760    22812      +52     

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

[samdark]

Thank you, @softark!