optimization dictfetchall in documentation

[Artyem Klimenko]

​https://docs.djangoproject.com/en/1.8/topics/db/sql/

def dictfetchall(cursor):
    "Return all rows from a cursor as a dict"
    columns = [col[0] for col in cursor.description]
    return [
        dict(zip(columns, row))
        for row in cursor.fetchall()
    ]

[Tim Graham <timograham@…>]

In 361f604:

Fixed #25455 -- Optimized dictfetchall() example.

Thanks aklim007 for the suggestion.

[Tim Graham <timograham@…>]

In bb90e8f:

[1.8.x] Fixed #25455 -- Optimized dictfetchall() example.

Thanks aklim007 for the suggestion.

Backport of 361f60479d1890e8144fc254d7389a67b35725e9 from master

[Tim Graham <timograham@…>]

In ca2c5508:

[1.9.x] Fixed #25455 -- Optimized dictfetchall() example.

Thanks aklim007 for the suggestion.

Backport of 361f60479d1890e8144fc254d7389a67b35725e9 from master