Update tools_google_search_with_txt.go: Add exclude domains example

[tbeyer-google]

Description

Fixes #

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Checklist

• [ x] I have followed Contributing Guidelines from CONTRIBUTING.MD
• [x ] Tests pass: go test -v ./.. (see Testing)
• [ x] Code formatted: gofmt (see Formatting)
• [x ] Vetting pass: go vet (see Formatting)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• [x ] Please merge this PR for me once it is approved

[gemini-code-assist]

Summary of Changes

Hello @tbeyer-google, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the genai package's Google Search tool by introducing an explicit example of how to utilize the ExcludeDomains feature. This change provides developers with a practical demonstration of filtering search results, making it easier to implement more targeted and controlled Google Search functionalities within their applications.

Highlights

• Google Search Tool Configuration: An example has been added to demonstrate how to configure the genai.GoogleSearch tool to exclude specific domains from search results.
• Exclude Domains Functionality: The ExcludeDomains field within the genai.GoogleSearch tool is now showcased with sample domain values, providing a clear usage pattern.

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[gemini-code-assist]

Code Review

This pull request adds an example of how to use the ExcludeDomains feature with the Google Search tool. The change is correct and demonstrates the feature. I have one suggestion to improve the example by using reserved domain names like example.com instead of real ones, which is a common best practice for documentation and example code.