[docs] [issue7061] Improve 24.5. turtle doc

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

Attaching another small doc improvement: "gon" is better know as "grad" and even under that name requires an explanation. See issue7061a.diff

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Added file: http://bugs.python.org/file19404/issue7061a.diff

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