minor symfony#8787 Remove references to "standard edition" or "distributions" (javiereguiluz)

This PR was merged into the 4.0 branch.

Discussion
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Remove references to "standard edition" or "distributions"

This one was simple.

There are still references to this in `/contributing/code/reproducer.rst`, but the update is complex. We'll reword it later.

Commits
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10116b2 Remove references to "standard edition" or "distributions"

Author: weaverryan

reference/configuration/twig.rst

@@ -228,8 +228,9 @@ charset
 
 **type**: ``string`` **default**: ``'%kernel.charset%'``
 
-The charset used by the template files. In the Symfony Standard edition this
-defaults to the ``UTF-8`` charset.
+The charset used by the template files. By default it's the same as the value of
+the ``kernel.charset`` container parameter, which is ``UTF-8`` by default in
+Symfony applications.
 
 date
 ~~~~