download_url DocBloc suggests to use unlink() over wp_delete_file()

[bedas]

The DocBloc of ​https://developer.wordpress.org/reference/functions/download_url/ suggests to unlink() the file, while according WPCS we should wp_delete_file().

This trac merely is to update the docbloc

• Adds reference to wp_delete_file() instead of unlink()

[SergeyBiryukov]

Hi there, thanks for the ticket!

Depending on the context, it looks like moving the temporary file to another location might also be common here, so instead of mentioning unlink() or wp_delete_file() specifically, perhaps the DocBlock could just state that the calling function must delete or move the file.

[SergeyBiryukov]

In 57027:

Docs: Improve documentation for wp_tempnam() and download_url().

Instead of mentioning the unlink() function specifically, the DocBlock should state that the calling function must delete or move the temporary file.

Follow-up to [6779], [12151].

Props bedas.
Fixes #59761.

Thanks for the PR! Merged in r57027 with some adjustments per comment:2.