Issue #3080106 by kiamlaluno: Drupal::config() incorrectly implies you can...

Issue #3080106 by kiamlaluno: Drupal::config() incorrectly implies you can edit the config it returns

core/lib/Drupal.php

@@ -349,12 +349,14 @@ public static function lock() {
    *
    * This is the main entry point to the configuration API. Calling
    * @code \Drupal::config('book.admin') @endcode will return a configuration
-   * object in which the book module can store its administrative settings.
+   * object the Book module can use to read its administrative settings.
    *
    * @param string $name
-   *   The name of the configuration object to retrieve. The name corresponds to
-   *   a configuration file. For @code \Drupal::config('book.admin') @endcode, the config
-   *   object returned will contain the contents of book.admin configuration file.
+   *   The name of the configuration object to retrieve, which typically
+   *   corresponds to a configuration file. For
+   *   @code \Drupal::config('book.admin') @endcode, the configuration
+   *   object returned will contain the content of the book.admin
+   *   configuration file.
    *
    * @return \Drupal\Core\Config\ImmutableConfig
    *   An immutable configuration object.