added password preview deployment docs

[chitalian]

Documentation changes

Documents the new per-preview password option added in mintlify/mint#6738, which lets Enterprise customers password-protect an individual preview deployment for external sharing.

Closes

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For Reviewers

When reviewing documentation PRs, please consider:

✅ Technical accuracy

• Code examples work as written
• Commands and configurations are correct
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• Prerequisites and requirements are accurate

✅ Clarity and completeness

• Instructions are clear and easy to follow
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Note

Low Risk
Documentation-only changes with no code-path or data-handling impact; primary risk is minor UI/feature description drift if product labels change.

Overview
Updates deploy/preview-deployments.mdx to document two ways to restrict preview access: org-wide authentication and per-preview password protection (Enterprise-only), including steps, password requirements, and screenshots.

Also aligns manual preview creation UI wording by changing the final action from Create deployment to Create preview.

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[mintlify]

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Project	Status	Preview	Updated (UTC)
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[ethanpalm]

lgtm!