Minor syntax error

components/cache/introduction.rst

@@ -44,7 +44,7 @@ Basic Usage
 This component is a strict implementation of `PSR-6`_, which means that the API
 is the same as defined in the standard. Before starting to cache information,
 create the cache pool using any of the built-in adapters. For example, to create
-a filesystem-based cache, instantiate :class:`Symfony\Component\Cache\Adapter\FilesystemAdapter`
+a filesystem-based cache, instantiate :class:`Symfony\\Component\\Cache\\Adapter\\FilesystemAdapter`
 and define the namespace used to store the items as the first argument::
 
  use Symfony\Component\Cache\Adapter\FilesystemAdapter;