fdo#71056 add <sup> to list of inline help XML tags

Conflicts:
	l10ntools/source/xmlparse.cxx

Change-Id: If0937bd571658e0f76a51e44dd3fa008f701f02e
Reviewed-on: https://gerrit.libreoffice.org/6895
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>