Correct thanks.dev instructions

[vladh]

Why:

The current thanks.dev instructions are wrong. This is the correct URL.

For example, this goes nowhere: https://thanks.dev/vladh

This goes somewhere: https://thanks.dev/u/gh/vladh

What's being changed (if available, include any code snippets, screenshots, or gifs):

I've only changed the thanks.dev FUNDING file example.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require a SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing.

[welcome]

Thanks for opening this pull request! A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[vladh]

Another option would be to leave the FUNDING file example as is, and have GitHub prefix all thanks.dev URLs with u/gh/.

[github-actions]

Automatically generated comment ℹ️

This comment is automatically generated and will be overwritten every time changes are committed to this branch.

The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/displaying-a-sponsor-button-in-your-repository.md	fpt ghec	fpt ghec

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server

[nguyenalex836]

@vladh Thanks so much for opening a PR! I'll get this triaged for review ✨

[subatoi]

@vladh Thanks for spotting this and raising a fix! I'll get this merged now.

[github-actions]

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