Fix typo and add link to RFC in documentation on match

Author: tgalopin

Resources/doc/reference/configuration/match.rst

@@ -128,8 +128,8 @@ regular expressions.
 
 **type**: ``array``
 
-By defaut, a rule will only match cacheable status codes: 200, 203, 300, 301,
-302, 404 and 410.
+By default, a rule will only match cacheable status codes: 200, 203, 300, 301,
+302, 404 and 410 (as described in the `RFC 7231`_).
 
 `additional_cacheable_status` let you define a list of additional HTTP
 status codes of the response for which to also apply the rule.
@@ -167,3 +167,4 @@ inside the same rule.
 
 .. _Trusting Proxies: http://symfony.com/doc/current/components/http_foundation/trusting_proxies.html
 .. _controllers as services: http://symfony.com/doc/current/cookbook/controller/service.html
+.. _RFC 7231: http://tools.ietf.org/html/rfc7231#page-48