[docs] [issue21662] datamodel documentation: fix typo and phrasing

[Steve Dougherty]

New submission from Steve Dougherty:

"Should" was missing an o, and putting the reason first makes the sentence flow better.

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assignee: docs at python
components: Documentation
files: typo2.diff
keywords: patch
messages: 219763
nosy: docs at python, sdougherty
priority: normal
severity: normal
status: open
title: datamodel documentation: fix typo and phrasing
versions: Python 3.5
Added file: http://bugs.python.org/file35484/typo2.diff

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<http://bugs.python.org/issue21662>
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