Modify the name of the 'IRC discussion' paragraph to just 'IRC' so that
the links keep working and remove the raw HTML anchors.

Adjustment is needed for documents which were using the '#email' anchor
which has now become '#mailing-lists'.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>