Project: help  7c74f4a55c7171419a78aa18f6d8842fe4f62833

Added description and examples of the AVERAGEIF function

UPD: Changed in accordance with the comment of Olivier Hallot (Sep 29 7:31 PM)
	Added value for the missing ID (string 80)
UPD2: typo: forboth -> for both
	table for an example was moved to a separate file
	the attribute "role" of the tag "paragraph" for all an example
has been changed from "paragraph" to "example"
UDP3: double IDs was deleted in ex_data_stat_func.xhp

Change-Id: I31b377715db133bfaab59047f9613171db8659e1
Reviewed-on: https://gerrit.libreoffice.org/18888Reviewed-by: Olivier Hallot <olivier.hallot@edx.srv.br>
Tested-by: Olivier Hallot <olivier.hallot@edx.srv.br>