Additional warning message documentation

[befriendabacterium]

Is your feature request related to a problem? Please describe. When I produce my PRISMA diagram, I get warnings like:

Warning message:
In PRISMA2020::PRISMA_flowdiagram(data = PRISMAdata_list, detail_databases = T,  :
  1.5

It's not clear what this refers to, as my PRISMA diagram looks fine.

Describe the solution you'd like Some more documentation.

Describe alternatives you've considered NA

Additional context NA