[docs] [issue38178] Remove explicit "loop" argument from EchoClientProtocol example

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Hrvoje, thanks for fixing this.

Next time, please involve the people who originally wrote the code.  They are both still active.  If they made mistakes, it helps them to know about it.  If they had a specific intent for the code example, it allows them to make sure the objectives are still being achieved.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38178>
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