Fixed the import in the PHP Array Cache adapter article #9129
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This fixes #8672.
In 3.3 and 3.4 is wrong: http://symfony.com/doc/3.3/components/cache/adapters/php_array_cache_adapter.html
In current/master is correct: http://symfony.com/doc/current/components/cache/adapters/php_array_cache_adapter.html