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

[marekdedic]

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

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

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

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

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_section 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[] ;)

[amolv]

48346.1.patch​ to add documetation to WP_Customize_Section::__construct() and reference to WP_Customize_Manager::add_section.

[kirasong]

We took a look at this in triage, and it looks like the patch no longer applies, so marking it as needs-refresh.

[SergeyBiryukov]

In 47386:

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

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

Props amolv, marekdedic.
Fixes #48346.