[EFL] Correct documentation for ewk_settings APIs
https://bugs.webkit.org/show_bug.cgi?id=115507

Patch by Jose Lejin PJ <jose.lejin@gmail.com> on 2013-05-08
Reviewed by Gyuyoung Kim.

Corrected documentation for ewk_settings APIs.

* ewk/ewk_settings.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149719 268f45cc-cd09-0410-ab3c-d52691b4dbfc