docs: apply sentence style capitalization to headings

[devin-ai-integration]

Apply sentence style capitalization to headings

This PR updates headings in extension documentation files to use sentence style capitalization, as requested in PR #3176.

Changes made:

• Updated headings in pgcrypto.md
• Updated headings in unaccent.md
• Updated headings in uuid-ossp.md

Examples of changes:

• "Performance and Indexing Considerations" → "Performance and indexing considerations"
• "UUID Functions" → "UUID functions"

Technical terms like PostgreSQL commands, SQL keywords, and extension names remain capitalized.

Original PR: #3176
Requested by: Daniel Price ([email protected])
Link to Devin run: https://app.devin.ai/sessions/2c673d4636cb48ac81510fdbe33b6218

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Name	Status	Preview	Comments	Updated (UTC)
neon-next	❌ Failed (Inspect)			Mar 18, 2025 7:03pm

[devin-ai-integration]

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[danieltprice]

handled in another PR