How to override default implementation of what lines to show in documentation window?

[Sebastian-Nielsen]

This almost works:

require("cmp").setup({
  formatting = {
    format = function(entry, vim_item) 
      entry.completion_item.documentation = "hello there"
    end
  }
})

How do I remove the other lines in the documentation-window so I only see "hello there"?

[Sebastian-Nielsen]

Overwriting entry.get_documentation did the job

	entry.get_documentation = function(self)
		return {"aaaa", "bbbbb"}
	end