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

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

For deque, we have d[0].  Is anything more needed?  Even lists don't require a peek.

For Queue, I'm not sure I've ever seen any use case for peek.  What do you have in mind?  

* https://docs.oracle.com/javase/7/docs/api/java/util/Queue.html#peek()

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versions:  -Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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