docs(accordion): rewrite Schema block to match the real AccordionSchema/AccordionItem interface

[yinlianghui]

Fixes#4722

What changed

content/docs/components/disclosure/accordion.mdx's "Schema" code block taught a
fictional shape that never existed on the real interface. Rewrote it to match
packages/types/src/disclosure.ts's AccordionSchema/AccordionItem field-for-field,
post-#4723 (which retired icon):

Docs said (before)	Reality (packages/types/src/disclosure.ts)
items: Array< { title, content } >	items: AccordionItem[] — AccordionItem requires value: string (missing from docs entirely)
content: string | SchemaNode	content: SchemaNode | SchemaNode[]
defaultOpen?: number[]	doesn't exist — real key is defaultValue?: string | string[]
multiple?: boolean	doesn't exist — real key is accordionType?: 'single' | 'multiple'
(missing)	collapsible?: boolean, value?: string | string[], onValueChange?: (value) => void, variant?: 'default' | 'bordered' | 'separated', item-level disabled?: boolean

defaultOpen/multiple never existed on the real interface — this was an early draft of
the component that was never updated as the interface evolved, not a two-name rename.

Same-page drift sweep

Per the card's sweep instruction, checked every other code block on the page. The page has
exactly one other block: the SchemaExample demo component (id
components-disclosure-accordion/basic-accordion), which is a live-rendered demo, not an
inline fenced code block, and the prose above it ("The second item sets disabled: true
...") is already accurate against the real, now-honored AccordionItem.disabled. No
further drift found on this page.

Out of scope (filed, not fixed here)

While reading the renderer to confirm the real interface, found that the schema-catalog's
own basic-accordion.json — the JSON backing that SchemaExample demo — omits the
required value key on every item, silently tolerated by a renderer-side fallback
(item.value || item-${index}). Different file, different defect class (a required-key
omission in an authored example vs. this card's stale-prose-in-docs), so filed separately
rather than folded in here: #4726.

Verification

Docs-only change (content/), no interface/renderer edits, no content/docs/releases/
touched.

• node scripts/check-doc-links.mjs — Links are valid across 13 scan roots.
• node scripts/check-control-bytes.mjs — OK (scanned 4250 tracked text file(s); skipped 85 binary).
• node scripts/check-changeset-presence.mjs — No source of a released package changed in this range, so no changeset is owed. (content/ is not under a released package's src/; no changeset added, per the gate's own verdict.)

All three re-run at the final commit, HEAD 9e4735e5f.

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[yinlianghui]

Review verdict: ACCEPT (reviewer of record, PM session session_01RnQd8iMMUwXQEV1crFmQiQ).

Verified against this PR, not the report: one changed file, Fixes #4722 the only closing keyword, no changeset per the presence gate's own verdict. The before/after table documents each fabrication (defaultOpen/multiple never existed on the real interface — an unrevised early draft, correctly identified as such rather than guessed to be a rename), the required AccordionItem.value is now taught, and the same-page sweep accounts for the only other block. The adjacent catalog defect found while confirming the real interface is filed as its own card instead of scope-creeping in — the right split. Gates pinned to 9e4735e5f, matching this PR's current head.

Will flip ready + enable auto-merge once Lint, Type Check, and Test shards 1–4 conclude success on this head.

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