Editor: Correct `since` annotation for the `excerpt_allowed_blocks` filter.

Props mukesh27, rabmalin.
Fixes #47079.

git-svn-id: https://develop.svn.wordpress.org/trunk@45284 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/blocks.php

@@ -149,7 +149,7 @@ function excerpt_remove_blocks( $content ) {
 	 * If a dynamic block is added to this list, it must not generate another
 	 * excerpt, as this will cause an infinite loop to occur.
 	 *
-	 * @since 4.4.0
+	 * @since 5.0.0
 	 *
 	 * @param array $allowed_blocks The list of allowed blocks.
 	 */