Translation edit: FAQ; performance metrics

Note to the translators:

There are four instances where "performance metrics" appear in the FAQ page.
In two cases, it is translated as "成績報告" and another two as "パフォーマンス報告."
Please modify and translate it as "掲載結果" (add データ or レポート if necessary) from now on.

You can find them under these titles:

• Where can I view Google AdWords performance metrics for a specific Merchant?
• How can a Merchant view their Google AdWords performance metrics directly?

The terms are included in the title as well. Please make sure you modify all the four instances. Thank you.