SG-41115 Cleanup Python code examples in docs

[julien-lang]

The goal of this PR is to update all Python code example in the docs and make them easier to read.

[Copilot]

Pull Request Overview

This PR standardizes Python code examples in the documentation by switching from single quotes to double quotes for strings, improving dictionary and list formatting with consistent indentation and trailing commas, and removing obsolete sections.

• Converts all Python string literals from single quotes to double quotes throughout code examples
• Reformats code examples with proper indentation, line breaks, and trailing commas for better readability
• Removes deprecated requirements.txt installation section from installation docs

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docs/reference.rst	Updates code examples to use double quotes and improved formatting; adds inline comments for clarity
docs/installation.rst	Removes deprecated requirements.txt section and applies quote standardization
docs/index.rst	Reformats quickstart example with double quotes and improved structure
docs/cookbook/usage_tips.rst	Standardizes quotes and formatting across all usage examples
docs/cookbook/tasks/updating_tasks.rst	Converts task update examples to use double quotes
docs/cookbook/tasks/task_dependencies.rst	Updates task dependency examples with consistent formatting
docs/cookbook/tasks/split_tasks.rst	Reformats split task examples for better readability
docs/cookbook/examples/svn_integration.rst	Modernizes SVN integration example with double quotes and improved formatting
docs/cookbook/examples/basic_update_shot.rst	Updates basic shot update example to use double quotes
docs/cookbook/examples/basic_sg_instance.rst	Converts instance creation example to double quotes
docs/cookbook/examples/basic_find_shot.rst	Standardizes find operation examples
docs/cookbook/examples/basic_delete_shot.rst	Updates delete examples with double quotes
docs/cookbook/examples/basic_create_version_link_shot.rst	Reformats version creation example with improved structure
docs/cookbook/examples/basic_create_shot.rst	Updates shot creation example formatting
docs/cookbook/examples/ami_version_packager.rst	Modernizes AMI packager example with double quotes and better formatting
docs/cookbook/examples/ami_handler.rst	Updates AMI handler example with consistent quote style
docs/cookbook/attachments.rst	Reformats attachment handling examples throughout
docs/authentication.rst	Updates authentication examples to use double quotes

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