chore(genai): update text generation samples

[Guiners]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• 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 pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow 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
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[gemini-code-assist]

Summary of Changes

Hello @Guiners, 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 appears to be a test PR, likely intended to validate the CI/CD pipeline or the pull request workflow. The only change introduced is a very minor, cosmetic adjustment to a test description string, specifically adding a period at its conclusion.

Highlights

• Test Description Update: A minor cosmetic change was made to the description string of an it block within the genai/test/textgen-with-multi-img.test.js file. A period was added to the end of the test description for consistency.

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[gemini-code-assist]

Code Review

This pull request adds a period to the end of a test description string. My review focuses on maintaining stylistic consistency across the project's test files. I've recommended removing the period to align with the style of other existing tests.