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

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Thanks Michael Anckaert, I merged your PR and backported it to 2.7, 3.7 and 3.8 branches.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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