Docs: Update code examples formatting in WP_HTML_Tag_Processor documentation.

Per the [https://developer.wordpress.org/coding-standards/inline-documentation-standards/php/#description documentation standards], code samples should be created by indenting every line of the code by 4 spaces, with a blank line before and after. This matches the format used by the rest of core.

Follow-up to [55203], [55304], [55718], [55724].

Props juanmaguitar, coffee2code, azaozz, costdev, dmsnell, johnbillion, SergeyBiryukov.
Fixes #58028.

git-svn-id: https://develop.svn.wordpress.org/trunk@55727 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-theme-json.php

@@ -66,15 +66,13 @@ class WP_Theme_JSON {
 	 *
 	 * They are a unkeyed array of values such as:
 	 *
-	 * ```php
-	 * array(
-	 *   array(
-	 *     'slug'      => 'unique-name-within-the-set',
-	 *     'name'      => 'Name for the UI',
-	 *     <value_key> => 'value'
-	 *   ),
-	 * )
-	 * ```
+	 *     array(
+	 *       array(
+	 *         'slug'      => 'unique-name-within-the-set',
+	 *         'name'      => 'Name for the UI',
+	 *         <value_key> => 'value'
+	 *       ),
+	 *     )
 	 *
 	 * This contains the necessary metadata to process them:
 	 *
@@ -2532,19 +2530,17 @@ class WP_Theme_JSON {
 	/**
 	 * For metadata values that can either be booleans or paths to booleans, gets the value.
 	 *
-	 * ```php
-	 * $data = array(
-	 *   'color' => array(
-	 *     'defaultPalette' => true
-	 *   )
-	 * );
+	 *     $data = array(
+	 *       'color' => array(
+	 *         'defaultPalette' => true
+	 *       )
+	 *     );
 	 *
-	 * static::get_metadata_boolean( $data, false );
-	 * // => false
+	 *     static::get_metadata_boolean( $data, false );
+	 *     // => false
 	 *
-	 * static::get_metadata_boolean( $data, array( 'color', 'defaultPalette' ) );
-	 * // => true
-	 * ```
+	 *     static::get_metadata_boolean( $data, array( 'color', 'defaultPalette' ) );
+	 *     // => true
 	 *
 	 * @since 6.0.0
 	 *