docs: update trademark symbol in 336

[danielclow]

use registered trademark symbol

[gemini-code-assist]

Summary of Changes

Hello @danielclow, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on a minor but important documentation refinement. It ensures that the official registered trademark symbol is consistently used for "TDengine" across the primary documentation page, aligning with proper branding and legal representation.

Highlights

• Documentation Update: The trademark symbol for "TDengine" has been updated from the unregistered trademark symbol (™) to the registered trademark symbol (®) in the main documentation index file.

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[gemini-code-assist]

Code Review

This pull request correctly updates the trademark symbol for TDengine from ™ to ® in docs/en/01-index.md. This is a good change for legal and branding consistency. To make the change more comprehensive, I suggest also updating other key files where TDengine is first mentioned, such as README.md and README-CN.md, to use the ® symbol as well. This will ensure consistent branding across the project's main documentation files.