Document tabular numbers in "Numerics" section

[srambach]

Is this a new page or a change to an existing one?
We have a modifier available to display numbers using .pf-v6-m-tabular-nums. This modifier sets font-variant-numeric: tabular-nums;. However, it is currently not documented anywhere. It seems like the Numerics page would be a good place.
https://staging-v6.patternfly.org/ux-writing/numerics

It may also be useful to mention this in the design guidelines for Table, as this would be a common place to want tabular numbers.
https://staging-v6.patternfly.org/components/table/design-guidelines