Fix fdo#80435: help pages for Calc new functions

Quartile, percentile, percentrank, rank.

Change-Id: I0cbc75a1f915898839223ab72be471926ab025c4
Reviewed-on: https://gerrit.libreoffice.org/11142
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>