The inspection you specified is not provided by PhpStorm 2016.1, but by the Symfony Plugin .
As with any other inspection, you can easily turn it off if you press Alt-Enter * or click the yellow lamp that appears at the beginning of the violation line, then select Disable inspection from the Inspection 'Yaml escaped \ in quoted inspection' options submenu.
You can also find this inspection in the Settings / Preference window under Editor β Inspections β Symfony β Twig .
* I use PhpStorm for OSX, and this is the default key combination.
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