Small typo in Json docs

[AndrewMorozko]

BPO	28155
Nosy	@zware

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2016-09-14.16:02:36.575>
created_at = <Date 2016-09-14.15:57:28.149>
labels = ['type-feature', 'invalid', 'docs']
title = 'Small typo in Json docs'
updated_at = <Date 2016-09-14.16:16:45.059>
user = 'https://bugs.python.org/AndrewMorozko'

bugs.python.org fields:

activity = <Date 2016-09-14.16:16:45.059>
actor = 'zach.ware'
assignee = 'docs@python'
closed = True
closed_date = <Date 2016-09-14.16:02:36.575>
closer = 'SilentGhost'
components = ['Documentation']
creation = <Date 2016-09-14.15:57:28.149>
creator = 'Andrew Morozko'
dependencies = []
files = []
hgrepos = []
issue_num = 28155
keywords = []
message_count = 3.0
messages = ['276467', '276468', '276469']
nosy_count = 4.0
nosy_names = ['SilentGhost', 'docs@python', 'zach.ware', 'Andrew Morozko']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue28155'
versions = ['Python 2.7']

[AndrewMorozko]

In Json module, example titled "Using json.tool from the shell to validate and pretty-print:"
5th line reads:
echo '{1.2:3.4}' | python -mjson.tool
should
echo '{1.2:3.4}' | python -m json.tool

[SilentGhost]

The space between -m switch and module name is not mandatory as you should be able to see if you run those examples.

[zware]

See 05e8b25379a3, though; it may be worth a backport. Not to 3.3, though; it's docs are not being updated anymore.