Fixed preferred choices example

Author: althaus

reference/forms/types/options/preferred_choices.rst.inc

@@ -5,7 +5,7 @@ preferred_choices
 
 If this option is specified as an array, then a sub-set of all of the options
 will be moved to the top of the select menu. The following would move the
-"Baz" option to the top, with a visual separator between it and the rest
+"Yes" option to the top, with a visual separator between it and the rest
 of the options::
 
     $builder->add('attending', 'choice', array(