Update documention to use V2 version of generics

[apatniv]

Existing documentation on master branch still refers to older version of gods before generics.

Example:

package main

import aq "github.com/emirpasic/gods/queues/arrayqueue"

// ArrayQueueExample to demonstrate basic usage of ArrayQueue
func main() {
    queue := aq.New()      // empty
    queue.Enqueue(1)       // 1
    queue.Enqueue(2)       // 1, 2
    _ = queue.Values()     // 1, 2 (FIFO order)
    _, _ = queue.Peek()    // 1,true
    _, _ = queue.Dequeue() // 1, true
    _, _ = queue.Dequeue() // 2, true
    _, _ = queue.Dequeue() // nil, false (nothing to deque)
    queue.Enqueue(1)       // 1
    queue.Clear()          // empty
    queue.Empty()          // true
    _ = queue.Size()       // 0
}

This needs to updated for generics. I am glad to update the documentation via a PR as well if there is no concern.