Added a few words

Author: Nyholm

components/cache.rst

@@ -195,10 +195,10 @@ For a list of all of the supported adapters, see :doc:`/components/cache/cache_p
 Serializing Data
 ----------------
 
-When an item is stored in the cache, it is serialised to a string. It a class implementing
-:class:`Symfony\\Component\\Cache\\Marshaller\\MarshallerInterface` that is responsible
-for serializing and unserializing. Or to be technically correct: To ``marshall()``
-and to ``unmarshall()``.
+When an item is stored in the cache, it is serialised to a string. It is a class
+implementing :class:`Symfony\\Component\\Cache\\Marshaller\\MarshallerInterface`
+that is responsible for serializing and unserializing. Or to be technically correct:
+to ``marshall()``and to ``unmarshall()``.
 
 The :class:`Symfony\\Component\\Cache\\Marshaller\\DefaultMarshaller` is using PHP's
 ``serialize()`` or ``igbinary_serialize()`` if the Igbinary extension is installed.