[Doc] docs(functions): update en, zh, ja documentation

[Seaven]

Why I'm doing:

What I'm doing:

EXECUTION SUMMARY
Document Type: functions
Duration: 7.58 seconds
Command: /home/seaven/documents/workspace/DocsAgent/src/docsagent/main.py -g -t functions --force_search_code -tv -n is_json_scalar --pr
Arguments:
  ├─ ci: False
  ├─ force_search_code: True
  ├─ generate: True
  ├─ include_miss_usage: False
  ├─ limit: None
  ├─ meta: False
  ├─ name: is_json_scalar
  ├─ pr: True
  ├─ track_version: True
  ├─ type: functions
  ├─ without_llm: False

ITEM EXTRACTION:
  ├─ Items from meta files: 316
  ├─ Items from code parsing: 0
  └─ Total unique items: 0

DOCUMENT GENERATION:
  └─ Total: 0 documents

This Pr is generated by DocsAgent

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 4.1
  • 4.0
  • 3.5
  • 3.4
  • 3.3

[github-actions]

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🕒 Last updated: Thu, 19 Feb 2026 15:56:24 GMT

[github-actions]

[Java-Extensions Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[FE Incremental Coverage Report]

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[github-actions]

[BE Incremental Coverage Report]

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