minor #11370 [Cache] Updated invalid service names (Nyholm)

This PR was merged into the 3.4 branch.

Discussion
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[Cache] Updated invalid service names

This will fix #8406

See https://github.com/symfony/symfony/blob/3.4/src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php#L1682

Commits
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53e465d [Cache] Updated invalid service names

Author: javiereguiluz

reference/configuration/framework.rst

@@ -1997,22 +1997,22 @@ default_doctrine_provider
 **type**: ``string``
 
 The service name to use as your default Doctrine provider. The provider is
-available as the ``cache.doctrine`` service.
+available as the ``cache.default_doctrine_provider`` service.
 
 default_psr6_provider
 .....................
 
 **type**: ``string``
 
 The service name to use as your default PSR-6 provider. It is available as
-the ``cache.psr6`` service.
+the ``cache.default_psr6_provider`` service.
 
 default_redis_provider
 ......................
 
 **type**: ``string`` **default**: ``redis://localhost``
 
-The DSN to use by the Redis provider. The provider is available as the ``cache.redis``
+The DSN to use by the Redis provider. The provider is available as the ``cache.default_redis_provider``
 service.
 
 default_memcached_provider
@@ -2024,7 +2024,7 @@ default_memcached_provider
 
 **type**: ``string`` **default**: ``memcached://localhost``
 
-The DSN to use by the Memcached provider. The provider is available as the ``cache.memcached``
+The DSN to use by the Memcached provider. The provider is available as the ``cache.default_memcached_provider``
 service.
 
 pools