Turtle spec should mention Logo Turtle (suggestion only)

Suggest adding a parag to the Intro

"W3C's Turtle language is unrelated to the earlier use of 'Turtle' as
a name for the <a
href="http://en.wikipedia.org/wiki/Turtle_graphics">Turtle
graphics</a> system often used with the <a
href="http://en.wikipedia.org/wiki/Logo_(programming_language)">Logo</a>
language.

cheers,

Dan