[docs] I found a typo on page https://docs.python.org/3/library/turtle.html

[靳阳]

Dear all, 
I found a typo on page https://docs.python.org/3/library/turtle.html 

It should be yinyang instead of yingyang 

The typo appears in section " 24.1.7. turtledemo — Demo scripts " 


To prove it is a typo, I run two commands as shown in the following picture. 
The first one throws one error, (The first command is python3 -m turtledemo.yingyang ) 
the second one works well. (The second command is python3 -m turtledemo.yinyang ) 


Best regards, 
from 靳阳 

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