[docs] Hacer copia de una lista que contiene listas

[Ktalov Morx]

Si,
     a = [ [1,2,3] ]
     b = a[:]
     b[0][0] =  7
Entonces resulta que el elemento 0 de A resulta afectado tambien,
     b = [ [7,2,3] ]
     a = [ [7,2,3]] ]
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