[docs] Suggested improvement to turtle module doc

[Éric Araujo]

Hi,

I was browsing through my ML archives and had an idea.  Context first:

> The turtle module provides both procedural and object-oriented
> interfaces.  In my opinion, beginners should start with the procedural
> interface and this is what is now used in the sidebar.  It is
> unfortunate that the manual uses "turtle" for both the name of the
> module and the name of the turtle instance used in OO examples.  Any
> suggestions on how to improve this are welcome.

What about using a first name for the Turtle instance, say zoe, and use
it in markup: zoe.forward(distance), zoe.right(angle), etc?

Regards