Scrutinizer Auto-Fixes

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/KNone/TranslateBundle/inspections/4788ee21-d300-4660-a0d1-d9ad1bd28486

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fix @return block for execute
fix doc block for ProviderInterface
Merge pull request #2 from KNone/scrutinizer-patch-1

Fix doc blocks