Simplify triangle description.
Simplify triangle description.

Also removing misleading line at the top, which says an error
should be thrown for degenerate triangles.

ErikSchierboom/x-common,petertseng/x-common,jmluy/x-common,petertseng/x-common,exercism/x-common,jmluy/x-common,Vankog/problem-specifications,kgengler/x-common,rpottsoh/x-common,jmluy/x-common,ErikSchierboom/x-common,kgengler/x-common,Vankog/problem-specifications,exercism/x-common,rpottsoh/x-common