1.5x, 1.6.5, 1.7.2 release notes

[ian-at-airbyte]

What

Adds expected release notes for 1.5.x, 1.6.5, 1.7.2.

How

Added some patch notes to the bottom of the relevant versions' release notes pages.

Review guide

User Impact

Can this PR be safely reverted and rolled back?

• YES 💚
• NO ❌

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Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 22, 2025 11:35pm

[github-actions]

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