mathlib3

c7963f40 - chore(data/mv_polynomial/basic): generalize lemmas about evaluation at zero (#15929)

chore(data/mv_polynomial/basic): generalize lemmas about evaluation at zero (#15929) This adds unapplied versions of the simp lemmas so that they apply more generally, and adds missing versions for `mv_polynomial.eval` and `mv_polynomial.eval₂`.