working on text-underline property finished

Hello all,

already I finished working on this property. Because there is not too much
information about this property I write what I can. Please check me and
give advise if I do something wrong.

Be nice, it's my first doc.

Link: http://docs.webplatform.org/wiki/css/properties/text-underline

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Regards
Łukasz Żak / WooCaSh