Bug 328711 valgrind.1 manpage "memcheck options" section is badly generated

Add missing para tags inside listitems. (Miroslav Franc, mfranc@redhat.com)

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13758 a5019735-40e9-0310-863c-91ae7b9d1cf9