diff -u b/core/modules/simpletest/src/AssertContentTrait.php b/core/modules/simpletest/src/AssertContentTrait.php
--- b/core/modules/simpletest/src/AssertContentTrait.php
+++ b/core/modules/simpletest/src/AssertContentTrait.php
@@ -393,7 +393,7 @@
    * @return bool
    *   TRUE on pass, FALSE on fail.
    *
-   * @see
+   * @see \Drupal\simpletest\AssertContentTrait::assertRaw()
    */
   protected function assertRaw($raw, $message = '', $group = 'Other') {
     if (!$message) {
@@ -512,7 +512,7 @@
   }
 
   /**
-   * Passes if the page (with HTML stripped) doesn't contains the text.
+   * Passes if the page (with HTML stripped) does not contains the text.
    *
    * Note that stripping HTML tags also removes their attributes, such as
    * the values of text fields.