[issue28987] Remove typo in whats new entry on Descriptor Protocol Enhancements

[Roundup Robot]

Roundup Robot added the comment:

New changeset a46a20a1f286 by Martin Panter in branch '3.6':
Issue #28987: Typos, grammar, spelling in documentation
https://hg.python.org/cpython/rev/a46a20a1f286

New changeset 28cf4ffcfbf3 by Martin Panter in branch 'default':
Issue #28987: Merge doc and comment fixes from 3.6
https://hg.python.org/cpython/rev/28cf4ffcfbf3

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nosy: +python-dev

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