diff with generator changes

[ohmayr]

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @ohmayr, 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 primarily focuses on a significant version update for the google-cloud-discoveryengine package, changing it from 0.15.0 to 0.4.0. Concurrently, widespread code formatting changes have been implemented across the client libraries and type definitions. These changes are mainly cosmetic, improving docstring readability and ensuring consistent documentation syntax, likely resulting from an automated code generation or linting process.

Highlights

• Version Update: The gapic_version.py files for both v1 and v1alpha Discovery Engine clients have been updated, changing the version from 0.15.0 to 0.4.0.
• Docstring Formatting: Extensive line wrapping and indentation adjustments have been applied to docstrings across numerous client and type definition files, enhancing readability and consistency.
• Documentation Syntax Refinement: Sphinx-style :class: references within docstrings have been updated to `:class:`` to ensure proper rendering in generated documentation.

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[gemini-code-assist]

Code Review

This pull request primarily consists of version updates for gapic_version.py files and extensive docstring reformatting across various service clients and type definitions. The docstring changes improve readability by adjusting line wrapping. These are positive changes that enhance code maintainability and clarity.