ascalad/Update connect-extension.md with metadata

[Ascalad]

Add description and keywords for connecting to MetaMask.

Description -->Pull request to connect the Metamask mobile extension, connect to the Metamask extension to fix the problem of receiving transactions, sending and receiving tokens, as well as depositing and receiving updates and changes.

Issue(s) fixed

Fixes #

Preview

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.

---

Note

Adds frontmatter (description, toc level, keywords) and a leading tab marker to wallet/how-to/connect-extension.md.

• Docs:
  • Update wallet/how-to/connect-extension.md:
    • Add frontmatter: description, toc_max_heading_level, keywords.
    • Prepend tab marker at top of file.

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