minor #7313 Documentation for Cookie::fromString (ro0NL, javiereguiluz)

This PR was merged into the master branch.

Discussion
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Documentation for Cookie::fromString

See #7278

First time, be patient :)

There's also 2nd argument in `fromString` controlling URL decoding,  implying `Cookie::isRaw`, but i tend to leave it an implementation detail.

Commits
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91329f4 Add method parenthesis
09e27fa version added
e233519 derp
a909e28 feedback
86fa70b Update http_foundation.rst

Author: javiereguiluz

components/http_foundation.rst

@@ -378,6 +378,12 @@ method takes an instance of
 You can clear a cookie via the
 :method:`Symfony\\Component\\HttpFoundation\\ResponseHeaderBag::clearCookie` method.
 
+Note you can create a 
+:class:`Symfony\\Component\\HttpFoundation\\Cookie` object from a raw header value using :method:`Symfony\Component\HttpFoundation\Cookie::fromString`.
+
+.. versionadded:: 3.3
+    The ``Cookie::fromString()`` method was introduced in Symfony 3.3.
+
 Managing the HTTP Cache
 ~~~~~~~~~~~~~~~~~~~~~~~