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What article on docs.github.com is affected?

https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/displaying-a-sponsor-button-in-your-repository#about-funding-files

What part(s) of the article would you like to see updated?

The sections on Custom URLs do not provide adequate information on the valid formats for a URL.

The following is the entire information:

Custom URL | custom: LINK1 or custom: [LINK1, LINK2, LINK3, LINK4]
Here's an example FUNDING.yml file:

github: [octocat, surftocat]
patreon: octocat
tidelift: npm/octo-package
custom: ["https://www.paypal.me/octocat", octocat.com]

Note
If a custom URL in an array includes :, you must wrap the URL in quotes. For example, "https://www.paypal.me/octocat".

The example, and the last note suggests that valid custom URL formats include values such as:

• octocat.com
• octocat.com/example
• octocat.com/example/#fund-me

However there is no schema validation to confirm this.

We encountered this as Packagist treats all of the above valid examples as invalid due to the lack of scheme:
composer/composer#12244

Additional information

No response