[docs] [issue28661] Fix code example in Python 3.5 telnetlib documentation

[R. David Murray]

R. David Murray added the comment:

Hmm.  I'm surprised that OSX would be different.  I didn't actually experiment to confirm it on linux, either.

I could be taken as a "teaching opportunity" to talk about exact match vs read_eager, in a comment before or after the example, if someone wants to propose a doc patch.  I'm not opposed to changing the example, but an explanation would probably be good either way.

Maybe Jack will have an opinion.

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assignee: docs at python -> 
nosy: +jackdied
versions: +Python 3.6, Python 3.7

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