Customizer class and file header DocBlocks cleanup

[DrewAPicture]

All core files should have a standalone file header including a package and subpackage. Within those files, each class should have their own class DocBlocks.

[DrewAPicture]

In 31539:

Add a missing file header and clean up class DocBlocks in wp-includes/class-wp-customize-control.php.

• Adds a file header separate from the WP_Customize_Control class block
• Fixes formatting for the WP_Customize_Control, WP_Customize_Color_Control, WP_Customize_Upload_Control, WP_Customize_Image_Control, WP_Customize_Background_Image_Control, WP_Customize_Theme_Control, WP_Customize_New_Theme_Control, WP_Widget_Area_Customize_Control, and WP_Widget_Form_Customize_Control class DocBlocks.
• Adds a missing class DocBlock for WP_Customize_Header_Image_Control

See #31446.

[DrewAPicture]

In 31540:

Add a missing file header to wp-includes/class-wp-customize-manager.php, separate out the class DocBlock for WP_Customize_Manager.

See #31446.

[DrewAPicture]

In 31541:

Add a missing file header to wp-includes/class-wp-customize-panel.php, separate out the class DocBlock for WP_Customize_Panel.

See #31446.

[DrewAPicture]

In 31542:

Add a missing file header and clean up class DocBlocks in wp-includes/class-wp-customize-section.php.

• Adds a file header separate from the WP_Customize_Section class block
• Fixes formatting for the WP_Customize_Section, WP_Customize_Themes_Section, and WP_Customize_Sidebar_Section class DocBlocks.

See #31446.

[DrewAPicture]

In 31543:

Add a missing file header and clean up class DocBlocks in wp-includes/class-wp-customize-setting.php.

• Adds a file header separate from the WP_Customize_Setting class block
• Fixes formatting for the WP_Customize_Setting, WP_Customize_Filter_Setting, WP_Customize_Header_Image_Setting, and WP_Customize_Background_Image_Setting class DocBlocks.

See #31446.

[DrewAPicture]

In 31544:

Add a missing file header to wp-includes/class-wp-customize-widgets.php, separate out the class DocBlock for WP_Customize_Widgets.

Fixes #31446.