Issue #3196433 by ayushmishra206, erricha, quietone: Link to php.net datetime...

Issue #3196433 by ayushmishra206, erricha, quietone: Link to php.net datetime formats documentation incorrect in FieldDateTest.php

(cherry picked from commit 9f7b53f0)

core/modules/views/tests/src/Kernel/Handler/FieldDateTest.php

@@ -75,7 +75,7 @@ public function testFieldDate() {
         'table' => 'views_test_data',
         'field' => 'created',
         'relationship' => 'none',
-        // ISO 8601 format, see http://php.net/manual/function.date.php
+        // ISO 8601 format, see https://www.php.net/manual/datetime.format.php
         'custom_date_format' => 'c',
       ],
       'destroyed' => [