While using reserved PHP keywords as parameter name labels is allowed, in the context of function calls using named parameters in PHP 8.0+, this will easily lead to confusion. To avoid that, it is recommended not to use reserved keywords as function parameter names.
This commit renames the `$object` variable to `$attachment` in `WP_Site_Icon::insert_attachment()` and updates the documentation accordingly.
Follow-up to [52946], [52996], [52997], [52998], [53003], [53014], [53029], [53039], [53116], [53117].
Props jrf, aristath, poena, justinahinon, SergeyBiryukov.
See #55327.
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