remove mention of USER-CUDA package and fix typo

are grouped by categories. Currently supported categories and

arguments are:

{package} (argument = {cuda} or {gpu} or {intel} or {kokkos} or {omp})

{package} (argument = {gpu} or {intel} or {kokkos} or {omp})

{newton} (argument = {pair} or {bond} or {any})

{pair} (argument = {single} or {respa} or {manybody} or {tail} or {shift})

{comm_style} (argument = {brick} or {tiled})

Example 2: use r-RESPA with inner/outer cutoff, if supported by pair style, otherwise fall back to using pair and reducing the outer time step

timestep $(2.0*(1.0+*is_active(pair,respa))

timestep $(2.0*(1.0+2.0*is_active(pair,respa))

if $(is_active(pair,respa)) then "run_style respa 4 3 2 2  improper 1 inner 2 5.5 7.0 outer 3 kspace 4" else "run_style respa 3 3 2  improper 1 pair 2 kspace 3" :pre

The {is_defined()} function allows to query categories like {compute},