[docs] [issue30621] import json before using json module in tutorial Input and Output

[Mariatta Wijaya]

Mariatta Wijaya added the comment:


New changeset 107949cb87d0f064bd9bcd39dc2a5e7266bfee30 by Mariatta in branch '2.7':
bpo-30621: Update Input Output Tutorial Example(GH-2074) (GH-2120)
https://github.com/python/cpython/commit/107949cb87d0f064bd9bcd39dc2a5e7266bfee30


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<http://bugs.python.org/issue30621>
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