docs: faq: move support table to CSV

docs: faq: move support table to CSV

as the current table format isn't really a recommended way to encode
tables for reStructuredText, and breaks various editor integrations
(and possibly parsing in the future).

From the two supported options, i.e., csv-table and list-table, the
first one seems to be easier to maintain in the long-run, so go for
that.

https://docutils.sourceforge.io/docs/ref/rst/directives.html#csv-table-1

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>