diff -u b/core/modules/config/config.module b/core/modules/config/config.module
--- b/core/modules/config/config.module
+++ b/core/modules/config/config.module
@@ -23,7 +23,7 @@
       $output .= '<dt>' . t('Importing a full configuration') . '</dt>';
       $output .= '<dd>' . t('You can upload a full site configuration from an archive file on the <a href="!url">Import</a> page. When importing data from a different environment, the site and import files must have matching configuration values for UUID in the <em>system.site</em> configuration item. That means that your other environments should initially be set up as clones of the target site. Migrations are not supported.', array('!url' => \Drupal::url('config.import_full'))) . '</dd>';
       $output .= '<dt>' . t('Synchronizing configuration'). '</dt>';
-      $output .= '<dd>' . t('You can review differences between the active configuration and an imported configuration archive on the <a href="!synchronize">Synchronize</a> page to ensure that the changes are as expected, before finalizing the import. The Synchronize page also shows configuration items that would be added or removed.', array('!synchronize' => \Drupal::url('config.sync'))) . '</dd>';
+      $output .= '<dd>' . t('You can also review differences between the active configuration and an uploaded configuration archive on the <a href="!synchronize">Import</a> page to ensure that the changes are as expected, before finalizing the import. The Import page also shows configuration items that would be added or removed.', array('!url' => \Drupal::url('config.import_full'))) . '</dd>';
       $output .= '<dt>' . t('Exporting a single configuration item') . '</dt>';
       $output .= '<dd>' . t('You can export a single configuration item by selecting a <em>Configuration type</em> and <em>Configuration name</em> on the <a href="!single-export">Single export</a> page. The configuration and its corresponding <em>*.yml file name</em> are then displayed on the page for you to copy.', array('!single-export' => \Drupal::url('config.export_single'))) . '</dd>';
       $output .= '<dt>' . t('Importing a single configuration item') . '</dt>';
reverted:
--- b/sites/default/default.services.yml
+++ a/sites/default/default.services.yml
@@ -51,7 +51,7 @@
     #   changes (see auto_reload below).
     #
     # For more information about debugging Twig templates, see
+    # https://www.drupal.org/node/1906392.
-    # http://drupal.org/node/1906392.
     #
     # Not recommended in production environments
     # @default false
reverted:
--- b/sites/default/default.settings.php
+++ a/sites/default/default.settings.php
@@ -22,7 +22,7 @@
  * 'sites/default' will be used.
  *
  * For example, for a fictitious site installed at
+ * https://www.drupal.org:8080/mysite/test/, the 'settings.php' file is searched
- * http://www.drupal.org:8080/mysite/test/, the 'settings.php' file is searched
  * for in the following directories:
  *
  * - sites/8080.www.drupal.org.mysite.test
@@ -44,7 +44,7 @@
  *
  * Note that if you are installing on a non-standard port number, prefix the
  * hostname with that number. For example,
+ * https://www.drupal.org:8080/mysite/test/ could be loaded from
- * http://www.drupal.org:8080/mysite/test/ could be loaded from
  * sites/8080.www.drupal.org.mysite.test/.
  *
  * @see example.sites.php
@@ -440,7 +440,7 @@
  * the code directly via SSH or FTP themselves. This setting completely
  * disables all functionality related to these authorized file operations.
  *
+ * @see https://www.drupal.org/node/244924
- * @see http://drupal.org/node/244924
  *
  * Remove the leading hash signs to disable.
  */
@@ -473,8 +473,8 @@
  * Note: Caches need to be cleared when this value is changed to make the
  * private:// stream wrapper available to the system.
  *
+ * See https://www.drupal.org/documentation/modules/file for more information
+ * about securing private files.
- * See http://drupal.org/documentation/modules/file for more information about
- * securing private files.
  */
 # $settings['file_private_path'] = '';