Update index.md

[DryOrIce]

Description

Issue(s) fixed

Fixes #

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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

Low Risk
Documentation-only one-line example change with no runtime, security, or API impact.

Overview
Replaces the placeholder to address in the Smart Accounts Kit quickstart sendUserOperation example with 0x949f2dfa7884066d22af572d7a029310fd684444.

No other docs or examples are updated.

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