WP_Customize_Setting::__construct() is missing `$args` documentation

[marekdedic]

Documentation for the fields of the $args argument is missing:

​https://developer.wordpress.org/reference/classes/wp_customize_setting/__construct/

I believe a good starting point would be the documentation of WP_Customize_Manager::add_setting():

​https://developer.wordpress.org/reference/classes/wp_customize_manager/add_setting/

Although I am not sure about the correctness of what's in there. But from the implementation of add_panel, I'd say they should match.

As per ​https://make.wordpress.org/core/handbook/best-practices/inline-documentation-standards/php/#1-1-parameters-that-are-arrays, there should only be a @see comment in add_setting and the documentation should be in the constructor I believe.

[marekdedic]

Also, I believe the type of theme_supports could be narrowed from string|array to string|string[] ;)

[tmanoilov]

Hello, I'm a first time contributor so please review and let me know if anything else needs to be done.

[SergeyBiryukov]

In 47384:

Docs: Add a reference to WP_Customize_Setting::__construct() for information on accepted arguments in WP_Customize_Manager::add_setting().

Synchronize the documentation between two places, use WP_Customize_Setting::__construct() as the canonical source.

Props tmanoilov, marekdedic.
Fixes #48347.

[SergeyBiryukov]

In 47385:

Docs: Clarify the type of theme_supports argument in various Customizer classes.

Props marekdedic.
See #48347.