Clean up @global doc blocks/imports for class-wp-customizer-*.php and friends.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32542 602fd350-edb4-49c9-b593-d223f7449a82

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

@@ -592,6 +592,8 @@ final class WP_Customize_Header_Image_Setting extends WP_Customize_Setting {
 	/**
 	 * @since 3.4.0
 	 *
+	 * @global Custom_Image_Header $custom_image_header
+	 *
 	 * @param $value
 	 */
 	public function update( $value ) {