doc: add RIB and FIB programmer guides

Currently, programmer's guide for the RIB and FIB libraries are missing.
This commit adds them.

Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin@intel.co

doc: add RIB and FIB programmer guides

Currently, programmer's guide for the RIB and FIB libraries are missing.
This commit adds them.

Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
Reviewed-by: Conor Walsh <conor.walsh@intel.com>

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