update dontrun to run_dontrun in demo

PRSim/DESCRIPTION

PRSim/man/PRSim-package.Rd

PRSim/man/fun_stoch_sim.Rd

PRSim/man/fun_stoch_sim_wave.Rd

PRSim/man/fun_stoch_sim_weather.Rd

lib/PRSim/DESCRIPTION

lib/PRSim/INDEX

lib/PRSim/Meta/Rd.rds

lib/PRSim/Meta/data.rds

lib/PRSim/Meta/demo.rds

lib/PRSim/Meta/features.rds

lib/PRSim/Meta/hsearch.rds

lib/PRSim/Meta/links.rds

lib/PRSim/Meta/nsInfo.rds

lib/PRSim/Meta/package.rds

lib/PRSim/NAMESPACE

lib/PRSim/NEWS.md

lib/PRSim/R/PRSim

lib/PRSim/R/PRSim.rdb

lib/PRSim/R/PRSim.rdx