fix: link to Firebase FCM API documentation

[fahadsohail482]

Updated the link to Firebase documentation for FCM API implementation.

Description

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
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  • Other (macOS, web)
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[CLAassistant]

All committers have signed the CLA.

[gemini-code-assist]

Summary of Changes

Hello, 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This pull request corrects a broken or outdated link within the messaging documentation. By updating the reference to the Firebase documentation, it ensures that developers are directed to the appropriate resource for configuring message payload options.

Highlights

• Documentation Update: Updated the external link for the Firebase Cloud Messaging (FCM) API implementation documentation to point to the correct, current URL.

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[gemini-code-assist]

Code Review

This pull request updates a Firebase documentation link in the messaging usage guide. The reviewer suggests using a broader link to the 'Customize messages' page rather than the specific 'Set message type' page to better reflect the variety of options discussed in the documentation.

[gemini-code-assist]

The updated link points specifically to the "Set message type" page. However, the preceding paragraphs discuss multiple message options including priority and content-available. Linking to the parent "Customize messages" page would be more appropriate as it covers all these configuration options in one place.

To learn more about how to send these options in your message payload, view the Firebase documentation for your [FCM API implementation](https://firebase.google.com/docs/cloud-messaging/customize-messages).