Expand argument arrays in the function reference

[tellyworth]

Discussed in https://github.com/WordPress/wporg-developer/discussions/19

^{Originally posted by **tellyworth** May 27, 2022} Many WP functions use some form of `$args` array parameter, which leads to docs like this: https://developer.wordpress.org/reference/functions/wp_update_post/ It would be great to pull in and expand the details of the array arguments so it's not necessary to click through to another page.

[iandunn]

I think this was fixed by #96