diff --git a/core/includes/errors.inc b/core/includes/errors.inc
index 8b16e4d..17d4e7c 100644
--- a/core/includes/errors.inc
+++ b/core/includes/errors.inc
@@ -122,7 +122,7 @@ function error_displayable($error = NULL) {
  * @param bool $fatal
  *   An error is fatal in case:
  *     - An exception is thrown and not caught by something else.
- *     - A recoverable fatal error, which is a fatal error
+ *     - A recoverable fatal error, which is a fatal error.
  */
 function _drupal_log_error($error, $fatal = FALSE) {
   $is_installer = drupal_installation_attempted();
@@ -171,8 +171,8 @@ function _drupal_log_error($error, $fatal = FALSE) {
     }
   }
 
-  // Ensure to log out to error log for fatals, so developers can find the
-  // problems.
+  // Ensure to log out to error log for fatals, so developers can find and debug
+  // the problems
   if ($fatal) {
     error_log(sprintf('%s: %s in %s on line %d', $error['%type'], $error['@message'], $error['%file'], $error['%line']));
   }
diff --git a/core/modules/simpletest/src/TestBase.php b/core/modules/simpletest/src/TestBase.php
index 5a30ee7..52d0be1 100644
--- a/core/modules/simpletest/src/TestBase.php
+++ b/core/modules/simpletest/src/TestBase.php
@@ -821,7 +821,7 @@ protected function assertIdenticalObject($object1, $object2, $message = '', $gro
    * @return bool
    *   TRUE if the assertion succeeded, FALSE otherwise.
    *
-   * @see TestBase::prepareEnvironment()
+   * @see \Drupal\simpletest\TestBase::prepareEnvironment()
    * @see \Drupal\Core\DrupalKernel::bootConfiguration()
    */
   protected function assertNoErrorsLogged() {
@@ -831,7 +831,7 @@ protected function assertNoErrorsLogged() {
   }
 
   /**
-   * Asserts that a specific error have been logged to the PHP error.log.
+   * Asserts that a specific error has been logged to the PHP error log.
    *
    * @param string $error_message
    *   The expected error message.
@@ -839,7 +839,7 @@ protected function assertNoErrorsLogged() {
    * @return bool
    *   TRUE if the assertion succeeded, FALSE otherwise.
    *
-   * @see TestBase::prepareEnvironment()
+   * @see \Drupal\simpletest\TestBase::prepareEnvironment()
    * @see \Drupal\Core\DrupalKernel::bootConfiguration()
    */
   protected function assertErrorLogged($error_message) {
@@ -849,7 +849,6 @@ protected function assertErrorLogged($error_message) {
     }
 
     $content = file_get_contents($error_log_filename);
-    debug($content);
     $rows = explode("\n", $content);
 
     // We iterate over the rows in order to be able to remove the logged error