Update Taipei Metro service provider information

[pichuang]

Added Chunghwa Telecom as a service provider for Taipei Metro.

[prmerger-automator]

@pichuang : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[pichuang]

We already know that as of 8/12, Chunghwa Telecom has acquired the capability for Taipei Metro. It is recommended to add this.

[learn-build-service-prod]

Learn Build status updates of commit 2879c0b:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/expressroute/metro.md	✅Succeeded

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[Copilot]

Pull Request Overview

This PR updates the service provider information for Taipei Metro in the ExpressRoute documentation by adding Chunghwa Telecom to the list of available service providers.

• Added Chunghwa Telecom as a service provider in the Taipei Metro entry

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[Copilot]

The service provider name 'Chunghwa Telecom' in the last column is inconsistent with 'Chunghwa Telecom Co. Ltd' used in the location column. Consider using the same format (either abbreviated or full name) in both columns for consistency.

Suggested change

	| Taipei Metro | Chief Telecom<br>Chunghwa Telecom Co. Ltd | 2 | Taiwan North | &check; | Chunghwa Telecom |
	| Taipei Metro | Chief Telecom<br>Chunghwa Telecom Co. Ltd | 2 | Taiwan North | &check; | Chunghwa Telecom Co. Ltd |

[v-dirichards]

@duongau

Can you review the proposed changes?

This PR is related to #127769

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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