[docs] [issue35118] Add peek() or first() method in queue

[Windson Yang]

Windson Yang <wiwindson at gmail.com> added the comment:

For deque, we can add peek() function to deque or just make it clear in the document that we can use deque[0] to access the first element(I can only find index method in the document)

For Queue, I found Java and C++ has the function like first() or peek(), I'm not sure should we also implement a method like this.


* http://www.cplusplus.com/reference/queue/queue/

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<https://bugs.python.org/issue35118>
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