docs: fix type syntax _gutenberg_add_block_template_plugin_attribute() (

#68391)


Co-authored-by: justlevine <justlevine@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>

lib/compat/wordpress-6.7/compat.php

@@ -73,8 +73,8 @@ function ( $registered_template ) use ( $template_files ) {
 /**
  * Hooks into `get_block_template` to add the `plugin` property when necessary.
  *
- * @param [WP_Block_Template|null] $block_template The found block template, or null if there isn’t one.
- * @return [WP_Block_Template|null] The block template that was already found with the plugin property defined if it was registered by a plugin.
+ * @param WP_Block_Template|null $block_template The found block template, or null if there isn’t one.
+ * @return WP_Block_Template|null The block template that was already found with the plugin property defined if it was registered by a plugin.
  */
 function _gutenberg_add_block_template_plugin_attribute( $block_template ) {
 	if ( $block_template ) {