Add more multichain info

[alexandratran]

Description

• Add more info to multichain section
• Update remaining instances of "SDK" --> "MM Connect"
• Other minor changes

Preview

https://metamask-docs-eaydbvza2-consensys-ddffed67.vercel.app/sdk/multichain

Checklist

• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

External contributor checklist

• I've read the contribution guidelines.
• I've created a new issue (or assigned myself to an existing issue) describing what this PR addresses.

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Note

Add multichain connection/transactions guides and standardize docs to “MM Connect” across EVM guides and options reference.

• Multichain docs:
  • Add sdk/multichain/connect/guides/connect-to-multichain.md with setup and usage for EVM + Solana.
  • Add sdk/multichain/connect/guides/send-transactions.md with EVM/Solana transaction examples.
  • Populate sdk/multichain/index.md with overview and CardList links.
• EVM docs:
  • Standardize terminology from SDK to MM Connect across JavaScript, Wagmi, RainbowKit, ConnectKit, Dynamic, and React Native guides.
  • Minor code/example tweaks (e.g., un-comment iconUrl in examples, headings/phrasing updates).
  • Update sdk/evm/index.md card descriptions to “Set up MM Connect …”.
• Reference:
  • Update sdk/reference/options.md to refer to MM Connect in option descriptions and tips.
• About:
  • Change architecture image alt text to MM Connect architecture.

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Project	Deployment	Preview	Comments	Updated (UTC)
metamask-docs	Ready	Preview	Comment	Nov 18, 2025 2:57am

[shahbaz17]

lgtm