minor symfony#6404 fixed a typo (RickieL)

This PR was submitted for the 3.0 branch but it was merged into the 2.3 branch instead (closes symfony#6404).

Discussion
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fixed a typo

fixed a typo

Commits
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f483209 fixed a typo

Author: xabbuh

book/controller.rst

@@ -704,7 +704,7 @@ The Request and Response Object
 -------------------------------
 
 As mentioned :ref:`earlier <book-controller-request-argument>`, the framework will
-pass the ``Request`` object to any controller argument taht is type-hinted with
+pass the ``Request`` object to any controller argument that is type-hinted with
 the ``Request`` class::
 
     use Symfony\Component\HttpFoundation\Request;