Revert "Perl-5.18.2 doesn't like bare numbers  (0 seems to be OK for some reason)"

This reverts commit ad8279c13e675c8bb7950ce3581071d97b5fe34f.
Fix POD syntax of numeric =item

The value of =item cannot be simple numbers unless intending to create
a monotonic list starting at 1 (a numbered list rather than arbitrary
strings). Use Z<> to make them look like non-numeric strings.
POD tweak: Use term/definition rather than bullet-list to define values
POD fixes for =item syntax (sync with text-parsewords-pm-3.29-2)