Batch of edits for Data Retention, Apple, and Screen

[rchinn1]

This pull request makes a series of editorial and clarity improvements to the documentation, focusing on consistency, grammar, and readability. The changes include standardizing terminology, improving parallel structure, and clarifying descriptions across several documentation files.

Documentation and editorial improvements:

• Standardized terminology and improved parallel structure in lists and descriptions, such as changing "and" to "and/or" where appropriate, and making list punctuation consistent in src/privacy/data-retention-policy.md. [1] [2]
• Improved grammar, punctuation, and word choice for clarity and readability throughout src/connections/sources/catalog/libraries/mobile/apple/index.md, including section titles, option names, and warning/info boxes. [1] [2] [3] [4] [5] [6]
• Updated table headers and property descriptions for consistency in src/connections/spec/screen.md.
• Refined explanations and recommendations to ensure best practices are clearly communicated, such as setting device IDs and sending complete object data. [1] [2]
• Made section and heading capitalization consistent, such as "Effective date" and other section headers in src/privacy/data-retention-policy.md.

These changes help ensure the documentation is more professional, accurate, and user-friendly.

Proposed changes

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