Typo: update variable name in asyncio-sync docs

[goswami-rahul]

rename lock -> cond as the example is trying to show usage of Condition.

[the-knights-who-say-ni]

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[brandtbucher]

Thanks for your time @goswami-rahul, and welcome to CPython! I assume you've seen the bot's message about the CLA?

It looks like this change wasn't backported to 3.7 when it was made in d73ac0e. Maybe somebody can clarify what we do in this situation?

[brandtbucher]

@lisroach

[lisroach]

Oops, thanks for pointing this out @brandtbucher . I am going to try to backport the original in #16720, this PR should be closed. Thanks for the fix @goswami-rahul, look forward to seeing you around CPython!