Tests: Remove redundant @covers tags in wp_mail() tests.

`@covers` has already been added at the class level, so there is no need to add it to individual unit tests.

Follow-up to [54702], [60698].

Props mukesh27.
See #28059.

git-svn-id: https://develop.svn.wordpress.org/trunk@60699 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

tests/phpunit/tests/pluggable/wpMail.php

@@ -556,10 +556,9 @@ public function test_wp_mail_resets_properties() {
 	}
 
 	/**
-	 * Test that wp_mail() can send embedded images.
+	 * Tests that wp_mail() can send embedded images.
 	 *
 	 * @ticket 28059
-	 * @covers ::wp_mail
 	 */
 	public function test_wp_mail_can_send_embedded_images() {
 		$embeds = array(
@@ -593,11 +592,11 @@ public function test_wp_mail_can_send_embedded_images() {
 			$this->assertStringContainsString( 'cid:' . $key, $mailer->get_sent()->body, 'The cid ' . $key . ' is not referenced in the mail body.' );
 		}
 	}
+
 	/**
-	 * Test that wp_mail() can send embedded images as a multiple line string.
+	 * Tests that wp_mail() can send embedded images as a multiple line string.
 	 *
 	 * @ticket 28059
-	 * @covers ::wp_mail
 	 */
 	public function test_wp_mail_string_embeds() {
 		$embeds  = DIR_TESTDATA . '/images/canola.jpg' . "\n";