Docs: Fix typo in _get_block_template_file() DocBlock.

Follow-up to [55744].

See #59651.

git-svn-id: https://develop.svn.wordpress.org/trunk@57349 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/block-template-utils.php

@@ -251,7 +251,7 @@ function _get_block_templates_paths( $base_directory ) {
  * @param string $template_type 'wp_template' or 'wp_template_part'.
  * @param string $slug          Template slug.
  * @return array|null {
- *    Array with template metadata if $template_type is one of 'wp_template' or 'wp_template_part'.
+ *    Array with template metadata if $template_type is one of 'wp_template' or 'wp_template_part',
  *    null otherwise.
  *
  *    @type string   $slug      Template slug.