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IIRC the FAQ used to say that questions of thje form «tell me about X» (which are not even questions) are a bad fit for MO.
This is probably subsumed under the MathOverflow is not an encyclopedia item in the FAQ, but I think it would be useful to be a bit more explicit, as this kind of questions pops up quite often and it would then be useful to be able to point to the FAQ more concretely.
(A tell-me-all-about-X non-question can be turned into a great question, I think, with sufficient work from the asker, and this has happened several times. But...)
'How to ask' under 'be precise' (in particular later papragraphs) has something along these lines.
Perhaps this is what you remember.
Two very generic, recent, "tell me about" type questions.