Docs: Document the optional `$args` parameter in `wp_delete_term()` in the hash notation style.

Props slushman, swissspidy.
Fixes #34862.

Built from https://develop.svn.wordpress.org/trunk@35889


git-svn-id: https://core.svn.wordpress.org/trunk@35853 1a063a9b-81f0-0310-95a4-ce76da25c4cd