Translate auto-generated page title fallback

[mintlify]

Summary

• Translated the new auto-generated page title fallback documentation from organize/pages.mdx to Spanish, French, and Chinese
• Removed required attribute and added explanation of automatic title generation from file paths

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Note

Low Risk
Documentation-only updates in translated pages.mdx files; no runtime or configuration parsing logic changes, so risk is limited to potential wording/consistency issues.

Overview
Updates the Spanish, French, and Chinese organize/pages.mdx docs to reflect that the frontmatter title is optional (removing the required marker) and to explain the fallback behavior when it’s omitted (auto-generating a title from the file path, with an example).

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