docs: send user operations eoa doc

[RobChangCA]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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https://app.asana.com/0/1208241431426251/1208700857883332

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PR-Codex overview

This PR introduces a section on handling Externally Owned Account (EOA) connections in the send-user-operations.mdx file. It explains how to use the useSendUserOperation hook with EOA connections and provides a code example for sending user operations.

Detailed summary

• Added a new section titled Handling EOA Connections.
• Explained that no explicit Smart Contract Account (SCA) client is needed for EOA connections.
• Described how the SDK detects and handles EOA connections automatically.
• Provided a code example using the useSendUserOperation hook for sending user operations.

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