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There is no special document for these. You can refer to wiced_network_up() source code and check what exactly we are doing for each interface. This will give you an idea of what interface you need to select as per your requirement.
As per the naming convention the following is the short description:
WICED_STA_INTERFACE = WWD_STA_INTERFACE, /**< STA or Client Interface */
WICED_AP_INTERFACE = WWD_AP_INTERFACE, /**< softAP Interface */
WICED_P2P_INTERFACE = WWD_P2P_INTERFACE, /**< P2P Interface */
WICED_ETHERNET_INTERFACE = WWD_ETHERNET_INTERFACE, /**< Ethernet Interface */
WICED_INTERFACE_MAX, /** DO NOT USE - MUST BE AFTER ALL NORMAL INTERFACES - used for counting interfaces */
WICED_CONFIG_INTERFACE = WICED_AP_INTERFACE | (1 << 7), /**< config softAP Interface */
If you need more info please let me know.