replaced "nu" with "smoothness" throughout #436

Job	Run time
build-mpi (3.9)	2m 25s
build-docs (3.8)	2m 36s
build-jax (3.8)	2m 18s
build-mpi (3.10)	2m 28s
build-numpy (3.8, short)	1m 10s
build-jax (3.9)	2m 37s
build-numpy (3.8, optimize)	1m 8s
build-torch (3.8)	2m 34s
build-jax (3.10)	2m 8s
build-numpy (3.8, multivariate)	57s
build-torch (3.9)	1m 40s
build-numpy (3.8, optimize-experimental)	58s
build-torch (3.10)	2m 36s
build-numpy (3.9, short)	1m 8s
build-numpy (3.9, optimize)	55s
build-numpy (3.9, multivariate)	1m 3s
build-numpy (3.9, optimize-experimental)	1m 3s
build-numpy (3.10, short)	1m 5s
build-numpy (3.10, optimize)	49s
build-numpy (3.10, multivariate)	51s
build-numpy (3.10, optimize-experimental)	1m 0s
	33m 29s

Provide feedback