D27591: KAbstractFileItemActionPlugin: Add missing quotes in code example

[Alexander Lohnau]

alex added a reviewer: Frameworks.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D27591

To: alex, elvisangelaccio, #frameworks
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns