Tests: Correct test case name in _truncate_post_slug() tests.

Follow-up to [55208].

Props Soean, mukesh27.
See #64894.

git-svn-id: https://develop.svn.wordpress.org/trunk@62660 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

tests/phpunit/tests/post/truncatePostSlug.php

@@ -94,7 +94,7 @@ public function data_truncate_post_slug_should_truncate() {
 				'expected' => 'myslug',
 				'message'  => '"myslug%C4%85" should have been truncated to "myslug".',
 			),
-			'URL-encoded accent characters and "length" includes the fifth URL-encoded character' => array(
+			'URL-encoded accent characters and "length" includes the sixth URL-encoded character' => array(
 				'slug'     => 'myslug%C4%85',
 				'length'   => 12,
 				'expected' => 'myslug%C4%85',