Quotes are quotes — it is important to accurately reflect the original source we're quoting, and it's generally frowned upon to “revise” a quote such that we give the impression it says things it didn't (or says them in a different way).
That said, we don't need to use the quote as-is with all flaws intact.
There's editorial standards that let us add insertions or corrections or summaries in square brackets. Where we're not doing that, we can use [sic] to indicate an error (such as a typo) is present in the original source and wasn't introduced by us. Combining them, I'd quote someone saying “that thing is rely bad” as “[The vow of poverty] is rely[sic] bad” to help make it clearer. These bracketed bits let me add/clarify details, but without suggesting it was a literal part of the original quote — and [sic] lets me make it clear the typo isn't a flaw in my recreation of the original text.
In this case...
like most spells can a known cantrip be cast at a higher spell slot lvl. Aka sacred flame lvl 1 for 2d8 radiant dmg
... that'll be a lot of square brackets.
It'd be preferable to use another tool, paraphrasing, and make it clearer we're doing that. So I could write:
Q (paraphrased): Can a known cantrip be cast at a higher spell slot level? For example can Sacred Flame be cast at level 1 for 2d8 damage?
A: No, since cantrips don't use spell slots. — Jeremy Crawford, Lead Rules Designer D&D
(I don't know if that paraphrasing is accurate, but it's my best attempt not knowing the D&D 5e rules being discussed.)