pcr: prosody-modules: Explain what is removed
The information on the removals is based on the
"modules_requiring_special_treatment" file that has been sent by Wael
(the PKGBUILD author) on the parabola dev mailing list.
The pkgrev was not bumped because this commit should contain no
functional changes, and also because a packages were not built and
released yet.
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>