Docblock update for `get_sample_permalink_html` hook

[Enchiridion]

The docblock for the get_sample_permalink_html filter has 2 errors in it. Both $new_title and $new_slug can nulls as well as strings. This updates the docs for it.

[audrasjb]

Introduced in 2.9 via [34347], see #33927.

[SergeyBiryukov]

Hi there, thanks for the ticket!

Indeed, these values can be null if get_sample_permalink_html() was called with default parameters, and they are documented as string|null in the function DocBlock.

The patch looks good.

[audrasjb]

The patch indeed looks good, except that the last line of the docblock needs to be correctly indented. I'll fix it directly when committing.

[audrasjb]

In 55758:

Docs: Clarify @param types on get_sample_permalink_html filter.

$new_title and $new_slug can be null if get_sample_permalink_html()
was called with default parameters, and they are documented as
string|null in the function DocBlock.

Follow-up to [34347].

Props Enchiridion, audrasjb, SergeyBiryukov.
Fixes #58322.
See #33927. --Cette ligne, et les
suivantes
ci-dessous, seront ignorées--

M trunk/src/wp-admin/includes/post.php