[docs] [issue25866] Reference 3. Data Model: miscellaneous minor cleanups on the word "sequence".

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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keywords: +easy
nosy: +ezio.melotti
stage:  -> needs patch
versions: +Python 2.7, Python 3.5, Python 3.6

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