minor #8902 [VarDumper] DebugBundle is not enabled (nidzho, javiereguiluz)

This PR was merged into the 4.0 branch.

Discussion
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[VarDumper] DebugBundle is not enabled

DebugBungle is not enabled by default
symfony/symfony#25283

Commits
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aa2b15c Minor reword.
4aa0b99 Update var_dumper.rst

Author: xabbuh

components/var_dumper.rst

@@ -79,9 +79,8 @@ current PHP SAPI:
 DebugBundle and Twig Integration
 --------------------------------
 
-The DebugBundle allows greater integration of the component into the Symfony
-full-stack framework. It is enabled by default in the *dev* and *test*
-environment of the Symfony Standard Edition.
+The DebugBundle allows greater integration of this component into Symfony
+applications. 
 
 Since generating (even debug) output in the controller or in the model
 of your application may just break it by e.g. sending HTTP headers or