added Rd documentation for stan arguments to MCMCsuite
added Rd documentation for stan arguments to MCMCsuite

NLMichaud/nimble,nimble-dev/nimble,nimble-dev/nimble,NLMichaud/nimble,nxdao2000/nimble,nimble-dev/nimble,NLMichaud/nimble,nimble-dev/nimble,nimble-dev/nimble,nxdao2000/nimble,NLMichaud/nimble,nxdao2000/nimble,nxdao2000/nimble