docs: yaml_to_df() can't handle spaces in tool names

[kelly-sovacool]

Spaces get converted to periods, which then break separate_wider_delim

yaml_to_df <- function(y) {
  dat <- as.data.frame(y) %>% t() %>% as.data.frame()
  dat['names'] <- rownames(dat)
  dat <- as_tibble(dat)
  dat %>%
    separate_wider_delim(names, '.', names = c('name', 'value')) %>%
    pivot_wider(names_from = value, values_from = V1)
}

See sort/bed GNU coreutils entry