Docs: Correct `@return` type for `WP_Theme::get_post_templates()`.

The method returns an array of strings, not a single string.

Props mayankmajeji, salvatore.formisano.
Fixes #50020.
Built from https://develop.svn.wordpress.org/trunk@47631


git-svn-id: http://core.svn.wordpress.org/trunk@47406 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme.php

@@ -1189,8 +1189,8 @@ final class WP_Theme implements ArrayAccess {
 	 *
 	 * @since 4.7.0
 	 *
-	 * @return string Array of page templates, keyed by filename and post type,
-	 *               with the value of the translated header name.
+	 * @return string[] Array of page templates, keyed by filename and post type,
+	 *                  with the value of the translated header name.
 	 */
 	public function get_post_templates() {
 		// If you screw up your current theme and we invalidate your parent, most things still work. Let it slide.

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-alpha-47628';
+$wp_version = '5.5-alpha-47631';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.