[docs] [issue37823] Telnet documentation: fix the link to open()

[Michael Anckaert]

Michael Anckaert <michael.anckaert at sinax.be> added the comment:

I created a PR for this issue (PR 15281). If any changes are required I'm more than happy to make them.

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nosy: +michaelanckaert

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37823>
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