Review updates to horizontal slider example

[mcking65]

The following updates have been made to the
horizontal slider example page:

• Change page title to "Horizontal Slider Example".
• Fix page title tag.
• Revise to use current example template
• Write an introductory description.

Reviews Requested as of March 11, 2017

• Review by @annabbott
• Review by @jongund
• Review by @shirsha

[jongund]

These should be fixed now with the latest pull request, including JSCS issues

[ZoeBijl]

Thanks Jon! This issue is fixed in: 3b8c118