When adding function to trigger expression user can open combo box and choose a function from the list. The functions in the list are grouped by categories and the grouping differs from documentation:

1. count, countunique are under 'aggregate functions' section. I think they should be moved to 'history functions' like in frontend. Neither count or countunique work with _foreach() function results, so from usage they are more similar to history functions.
2. find function is under 'string functions' section. It really should be moved to 'history functions' because it works with item history.
3. min, max, sum, avg in documentation are listed as aggregate functions and as mathematical functions. They do have dual usage, so I would keep them documented as such. While in frontend there are options:
   1. leave in mathematical function section
   2. move to aggregate function section (they might be used more as aggregate functions)
   3. list them in two places (might be confusing)