doc: fix PDF build of bbdev prog guide
doc: fix PDF build of bbdev prog guide

Some machine (like on dpdk.org) may fail to build the prog guide PDF
because of a table characher being "+" instead of "|".

Some figure references are also fixed with automatic numbering.

Fixes: 3f3f608142cf ("doc: update bbdev guide for 5GNR operations")

Signed-off-by: Thomas Monjalon <5f50a84c1fa3bcff146405017f36aec1a10a9e38@monjalon.net>
Signed-off-by: Nicolas Chautru <5844138a49a7cd19205c4efe0c7b4bd431c6ad19@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk