bpo-10544: Deprecate "yield" in comprehensions and generator expressions. by serhiy-storchaka · Pull Request #4579 · python/cpython
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Using just "iterable" ended up looking odd in context (since executing an iterable could be taken to mean iterating over it).
However, "the iterable expression in the leftmost :keyword:for clause" reads reasonably well to me, and I also made it explicit that the leftmost filter condition is evaluated in the nested scope.
It may be worth our while to explicitly define "outermost iterable" as a formal term in the glossary, but I think that would be better handled as a distinct docs RFE.