docs(Accordion): correct value types

[SSDWGG]

Summary

• document null as the empty Accordion value
• update both English and Russian API tables

Fixes #2411

Summary by Sourcery

Documentation:

• Update Accordion API docs to document null as the empty value for defaultValue and value in both English and Russian tables.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates the Accordion component documentation in both English and Russian to correctly describe null as the empty value type for controlled (value) and uncontrolled (defaultValue) states instead of undefined.

File-Level Changes

Change	Details	Files
Correct documented value types for Accordion controlled and uncontrolled values.	Update English README API table to list `string	string[]

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#2411	Update the Accordion English documentation so that the value and defaultValue props are documented as having type `string	string[]	nullinstead ofstring
#2411	Update the Accordion Russian documentation so that the value and defaultValue props are documented as having type `string	string[]	nullinstead ofstring

Possibly linked issues

• Correct the accordion value type in docs #2411: PR directly fixes the issue by changing Accordion docs value/defaultValue types from undefined to null in both languages.

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