mathlib

74f6e95c - feat(data/real/ennreal): make of_real_sub easier to rewrite with (#16621)

feat(data/real/ennreal): make of_real_sub easier to rewrite with (#16621) A tiny edit to make this lemma more general for the purpose of rewriting - previously `q` was only for `nnreal` (even though it had the assumption of nonnegativity). Co-authored-by: Bhavik Mehta <bm489@cam.ac.uk>