[docs] [issue11465] Set documentation: Link to wikipedia

[Senthil Kumaran]

Senthil Kumaran <orsenthil at gmail.com> added the comment:

Only for relatively uncommon concepts like "Moving Average" and
some other cases used in collections module hyperlink to a general
article helps.

Set theory is a commonly understood concept and link to wikipedia
article may not be required. It can be left to the user to find out
more, if they want.

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nosy: +orsenthil

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