mathlib3

676e7725 - refactor(analysis/convex/specific_functions): Remove hypothesis from `deriv_sqrt_mul_log` (#15015)

refactor(analysis/convex/specific_functions): Remove hypothesis from `deriv_sqrt_mul_log` (#15015) This PR removes the `hx : 0 < x` hypothesis from `deriv_sqrt_mul_log`. Co-authored-by: Yury G. Kudryashov <urkud@urkud.name>