[docs] documentation bugs

[tomo cocoa]

Hello,

My name on Web is cocoatomo and I am now translating Python documents
into Japanese.

I found slight bugs in documents.

In library/ttk.rst, explanation for layout method of ttk.Style class,
there are duplicated word "described".

I'm not sure to find out another bug is really bug,
explanation for sticky option of ttk.Style.element_create method
uses 2-byte characters, open double quote「“」 and close double quote「”」.


I hope to contribute Python and favor her -- Python -- :)

Regards,

cocoatomo

-- 
class Cocoatomo:
    name = 'cocoatomo'
    email_address = 'cocoatomo77 at gmail.com'
    twitter_id = '@cocoatomo'