Improve documentation of dk_activity_units.R

[RasmusSkytte]

In the beginning of data-raw/dk_activity_units.R we have the following template:

# Template for adding new units: dk_activity_units |>                                                                 
# add_activity(activity = "<programmatic short hand for activity>",
#              label  = "<human readable label for activity>",
#              home = <number in [0, 1]>,
#              work = <number in [0, 1]>,
#              school = <number in [0, 1]>,
#              other = <number in [0, 1]>,
#              risk = <number in [0, 1]>)                                                                               

There are a few issues here that should be addressed:

• The arena numbers should be numeric(1) or numeric(n_age_groups)
• Risk can be larger than 1
• It should be more clear, how to make your own unit using this template. What are the numbers you should put in?