minor #1263 Fix typo in var-dumper.rst (andytruong)

This PR was merged into the 2.0.x-dev branch.

Discussion
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Fix typo in var-dumper.rst

Commits
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ca56d24d Update var-dumper.rst

doc/providers/var-dumper.rst

@@ -36,7 +36,7 @@ Usage
 Adding the VarDumper component as a Composer dependency gives you access to the
 ``dump()`` PHP function anywhere in your code.
 
-Ig you are using Twig, it also provides a ``dump()`` Twig function and a
+If you are using Twig, it also provides a ``dump()`` Twig function and a
 ``dump`` Twig tag.
 
 The VarDumperServiceProvider is also useful when used with the Silex