Tests: Correct the @covers tag in a test for strip_ws() utility function.

This addresses a notice when generating the code coverage report:
{{{
"@covers ::test_strip_ws" is invalid
}}}

Follow-up to [53686], [54049], [54050], [54051], [54052], [54055], [54056].

See #55652.

git-svn-id: https://develop.svn.wordpress.org/trunk@54057 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/utils.php

@@ -8,7 +8,7 @@
 class Tests_Utils extends WP_UnitTestCase {
 
 	/**
-	 * @covers ::test_strip_ws
+	 * @covers ::strip_ws
 	 */
 	public function test_strip_ws() {
 		$this->assertSame( '', strip_ws( '' ) );