docs: update FAQ
docs: update FAQ

Change-Id: I6728dee0f445ce7edfdc7bc1adfa761cbd754f34
Signed-off-by: Yaroslav Brustinov <58a360e80ce67a871f076847d255453a99d22580@cisco.com>

dimagol/trex-core,kisel/trex-core,kisel/trex-core,dimagol/trex-core,kisel/trex-core,dimagol/trex-core,dimagol/trex-core,kisel/trex-core,kisel/trex-core,dimagol/trex-core,dimagol/trex-core,kisel/trex-core