Issue #2676836 by xjm, alexpott: Update proxy class generator for new @file standard

core/lib/Drupal/Core/Command/GenerateProxyClassCommand.php

core/lib/Drupal/Core/ProxyClass/Batch/BatchStorage.php

core/lib/Drupal/Core/ProxyClass/Config/ConfigInstaller.php

core/lib/Drupal/Core/ProxyClass/Cron.php

...upal/Core/ProxyClass/Entity/ContentUninstallValidator.php

.../lib/Drupal/Core/ProxyClass/Extension/ModuleInstaller.php

...ProxyClass/Extension/RequiredModuleUninstallValidator.php

...l/Core/ProxyClass/Field/FieldModuleUninstallValidator.php

...ore/ProxyClass/File/MimeType/ExtensionMimeTypeGuesser.php

.../Drupal/Core/ProxyClass/File/MimeType/MimeTypeGuesser.php

core/lib/Drupal/Core/ProxyClass/Lock/DatabaseLockBackend.php

...al/Core/ProxyClass/Lock/PersistentDatabaseLockBackend.php

.../Drupal/Core/ProxyClass/PageCache/ChainResponsePolicy.php

...xyClass/ParamConverter/AdminPathConfigEntityConverter.php

...ore/ProxyClass/ParamConverter/MenuLinkPluginConverter.php

.../Drupal/Core/ProxyClass/Plugin/CachedDiscoveryClearer.php

...ib/Drupal/Core/ProxyClass/Render/BareHtmlPageRenderer.php

core/lib/Drupal/Core/ProxyClass/Routing/MatcherDumper.php

core/lib/Drupal/Core/ProxyClass/Routing/RouteBuilder.php

core/modules/book/src/ProxyClass/BookUninstallValidator.php