minor symfony#8833 Tipfeler required -> require (jankod)

This PR was merged into the 4.0 branch.

Discussion
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Tipfeler required -> require

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6b5b35a Tipfeler required -> require

Author: xabbuh

components/var_dumper.rst

@@ -20,7 +20,7 @@ You can install the component in 2 different ways:
 .. note::
 
     If using it inside a Symfony application, make sure that the DebugBundle has
-    been installed (or run ``composer required debug`` to install it).
+    been installed (or run ``composer require debug`` to install it).
 
 .. _components-var-dumper-dump: