Document the $theme property in WP_Customize_Themes_Section.

Also adds a missing `@access` tag to the DocBlock for `WP_Customize_Themes_Section->render()`.

See [31533]. See #31888.


git-svn-id: https://develop.svn.wordpress.org/trunk@32033 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-customize-section.php

@@ -330,12 +330,20 @@ class WP_Customize_Section {
  */
 class WP_Customize_Themes_Section extends WP_Customize_Section {
 
+	/**
+	 * Customize section type.
+	 *
+	 * @since 4.2.0
+	 * @access public
+	 * @var string
+	 */
 	public $type = 'themes';
 
 	/**
 	 * Render the themes section, which behaves like a panel.
 	 *
 	 * @since 4.2.0
+	 * @access protected
 	 */
 	protected function render() {
 		$classes = 'accordion-section control-section control-section-' . $this->type;