[Styler] Weekly style audit fixes (2026-09-22)

[JackReacher0807]

Weekly style audit against files changed by PRs merged in the last 7 days. All findings below are ERROR-level per STYLE_RULES.md — mechanical fixes only. WARNING-level issues (formatting whitespace, single-instance typos in older files) were skipped per Mode 4 guidance.

Fixes

content/api-reference/solana/solana-api-overview.mdx (from #1641, #1639, #1629, #1623)

• Rule: Factual accuracy in API reference
• Found: `getBalanceByOwnerAtSlot` was listed twice in the same row of the methods table (both cells identical).
• Fix: Removed the duplicate cell and re-flowed the two-column table so each row remains balanced. All 60 unique methods preserved.

content/api-reference/arc/arc-api-faq.mdx (from #1622)

• Rule: Grammar / factual correctness in headings
• Found: `## What is a Arc API key?`
• Fix: `## What is an Arc API key?`

content/api-reference/data/webhooks/webhook-types/address-activity-webhook.mdx (from #1630)

• Rule: Preferred terminology (STYLE_RULES §Terminology and naming)
• Found: `ERC20`, `ERC721`, `ERC1155` in prose and a table row.
• Fix: `ERC-20`, `ERC-721`, `ERC-1155`.

content/api-reference/introduction/api-overview.mdx (from #1636)

• Rule: Sentence case headings (STYLE_RULES §Voice and tone / §Write headings that help people scan)
• Found: `title: Choose Your Starting Point`
• Fix: `title: Choose your starting point`

Not fixed (flagged for human/writer)

• `arc-api-quickstart.mdx`: uses "familiar to developers who have worked with…" — mild "developer" reference; leaving for a Writer pass on the full quickstart section.
• `address-activity-webhook.mdx`: uses h1 (`# Introduction`, `# Example Response`, `# How to Set-Up Address Activity Webhook`) inside the page body instead of h2, and `Set-Up` should be `set up`. Pre-existing structural issue not introduced this week; needs a broader cleanup PR.
• `giwa-api-overview.mdx`, `solana-api-overview.mdx`, `arc-api-faq.mdx`, others: page titles use Title Case (`Giwa API Overview`, `Arc API FAQ`). This is the existing repo pattern across every `-api-overview.mdx` / `-api-faq.mdx` — worth a coordinated rename, not a one-off in this PR.

Verification

• `pnpm run lint` → 0 errors, 38 pre-existing warnings unrelated to these changes.
• No code samples modified.

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