Link out to wiki page for the concept of a "generator" #2985
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The term "generator" is used in a couple spots in the docs (e.g. in For Comprehensions in the Tour of Scala), but is never defined. As an alternative to this change, I welcome (and would even prefer) proposed definitions for the term, if the Scala concept does not completely line up with the wiki content - but I do not feel qualified to venture a definition myself.