[docs] [issue16728] Missing cross-reference in sequence glossary entry

[INADA Naoki]

INADA Naoki added the comment:

Thanks, Nick.

I see that the "sequence" doesn't have strict definition.

Though, I think collections.abc module's document should describe
this manner. For example:

"But checking type with these abc may be too strict for most case.
For example, some user defined sequence class may not cover
:class:`Sequence` abc. Using :term:`EAFP` manner is preferred in Python."

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16728>
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