[issue26029] Broken sentence in extending documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3f9b9244488d by Terry Jan Reedy in branch '3.5':
Issue #26029: Finish correction.
https://hg.python.org/cpython/rev/3f9b9244488d

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26029>
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