wizards: fix javadoc error: text not allowed in <ul> element

Change-Id: Ic50f9618c2649fe3e0fbbf2db6a09ea2e1d4c810
Reviewed-on: https://gerrit.libreoffice.org/11239
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>