Correct duplicate hook reference for 'notify_moderator'

[SergeyBiryukov]

Per the ​documentation standards, duplicate hook instances should be marked as such:

/** This filter is documented in path/to/filename.php */

The instance of the notify_moderator filter in wp_new_comment_notify_moderator() is marked with:

/** This filter is documented in wp-includes/comment.php */

However, the original filter location is wp_notify_moderator() in wp-includes/pluggable.php, so the reference in wp_new_comment_notify_moderator() should be corrected to:

/** This filter is documented in wp-includes/pluggable.php */

Follow-up to [35339], [35725].

See https://core.trac.wordpress.org/ticket/57808

[SergeyBiryukov]

In 55424:

Docs: Correct duplicate hook reference for notify_moderator.

The original filter location is wp_notify_moderator() in wp-includes/pluggable.php.

This commit updates the instance in wp_new_comment_notify_moderator() to point to the correct file.

Follow-up to [35339], [35725].

Props zevilz.
Fixes #57808.

Thanks for the PR! Merged in r55424.