bug symfony#8769 doc(http_foundation) (Sydney-o9)

This PR was submitted for the master branch but it was merged into the 2.7 branch instead (closes symfony#8769).

Discussion
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doc(http_foundation)

- [x] Fixed code error which used `create()` instead of constructor method.

Fix symfony#8768.

Commits
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038876e doc(http_foundation.rst): Fix code error which used create() instead of constructor method.

Author: weaverryan

components/http_foundation.rst

@@ -304,7 +304,7 @@ PHP callable that is able to create an instance of your ``Request`` class::
         array $server = array(),
         $content = null
     ) {
-        return SpecialRequest::create(
+        return new SpecialRequest(
             $query,
             $request,
             $attributes,