doc: clarify wording for flow rule actions in prog guide
doc: clarify wording for flow rule actions in prog guide

Current wording regarding actions and flow rules doesn't make sense.

Signed-off-by: Roy Franz <a58e234ead0397b00b518065b0b5eff3dd8aab1a@cavium.com>
Acked-by: Adrien Mazarguil <9d39ea493ca46c560334f650ac5d4b5ffbcb5cf0@6wind.com>

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