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

[Mariatta Wijaya]

Mariatta Wijaya added the comment:


New changeset 1dbce04d0e3e93b715eb0d8024da396361759d16 by Mariatta (suketa) in branch 'master':
bpo-30621: Update Input Output Tutorial Example(GH-2074)
https://github.com/python/cpython/commit/1dbce04d0e3e93b715eb0d8024da396361759d16


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nosy: +Mariatta

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