demo: Add word-wrap:break-word and remove parag. width

demo: Add word-wrap:break-word and remove parag. width

A page in Tizen widget demo app has a long word, which overflows the
screen width. A claim is issued in Tizen JIRA, pointing this overflow,
so this patch adds word-wrap:break-word option to separate long words
into two line.
And, paragraph width settings for sample code are removed, not to hide
some code area.
Solves N_SE-18310 and N_SE-19030.

Change-Id: I731a283e5a4e851ef5dc27e9750b84ffb3072c3d