Revise doxygen comment to remove unused st_things APIs
Revise doxygen comment to remove unused st_things APIs

Remove two st_things APIs in doxygen. It may be necessary to implement in a future, I only removed in doxygen list.
1. st_things_register_pin_handling_cb : Among the boards supported by TizenRT, there is no board providing pin based comfirmation. So TizenRT does not support this API.
2. st_things_deinitialize : It has not been implemented.

HONGCHAEHEE/TizenRT,pillip8282/TizenRT,an4967/TizenRT,sunghan-chang/TizenRT,btheosam/TizenRT,jsdosa/TizenRT,JeongJunSik/TizenRT,HONGCHAEHEE/TizenRT,jeongarmy/TizenRT,JeongJunSik/TizenRT,pillip8282/TizenRT,jeongarmy/TizenRT,btheosam/TizenRT,shivgarg/TizenRT,Parkjihooni6186/TizenRT,shivgarg/TizenRT,heejin-kim/TizenRT,jeongarmy/TizenRT,Parkjihooni6186/TizenRT,junmin-kim/TizenRT,junmin-kim/TizenRT,jeongchanKim/TizenRT,junmin-kim/TizenRT,heejin-kim/TizenRT,pillip8282/TizenRT,an4967/TizenRT,lokeshbv/TizenRT,chanijjani/TizenRT,btheosam/TizenRT,Parkjihooni6186/TizenRT,junmin-kim/TizenRT,JeonginKim/TizenRT,jeongchanKim/TizenRT,jsdosa/TizenRT,HONGCHAEHEE/TizenRT,pillip8282/TizenRT,an4967/TizenRT,HONGCHAEHEE/TizenRT,JeonginKim/TizenRT,heejin-kim/TizenRT,lokeshbv/TizenRT,jsdosa/TizenRT,JeonginKim/TizenRT,Samsung/TizenRT,an4967/TizenRT,sunghan-chang/TizenRT,jeongchanKim/TizenRT,shivgarg/TizenRT,Samsung/TizenRT,JeongJunSik/TizenRT,davidfather/TizenRT,an4967/TizenRT,Samsung/TizenRT,jeongchanKim/TizenRT,jsdosa/TizenRT,jeongarmy/TizenRT,davidfather/TizenRT,JeonginKim/TizenRT,davidfather/TizenRT,jeongarmy/TizenRT,chanijjani/TizenRT,heejin-kim/TizenRT,Parkjihooni6186/TizenRT,Parkjihooni6186/TizenRT,jeongarmy/TizenRT,davidfather/TizenRT,jsdosa/TizenRT,sunghan-chang/TizenRT,davidfather/TizenRT,an4967/TizenRT,junmin-kim/TizenRT,chanijjani/TizenRT,JeongJunSik/TizenRT,HONGCHAEHEE/TizenRT,shivgarg/TizenRT,pillip8282/TizenRT,lokeshbv/TizenRT,lokeshbv/TizenRT,jeongchanKim/TizenRT,lokeshbv/TizenRT,sunghan-chang/TizenRT,davidfather/TizenRT,davidfather/TizenRT,Samsung/TizenRT,sunghan-chang/TizenRT,an4967/TizenRT,heejin-kim/TizenRT,Samsung/TizenRT,junmin-kim/TizenRT,pillip8282/TizenRT,chanijjani/TizenRT,Samsung/TizenRT,Parkjihooni6186/TizenRT,jeongchanKim/TizenRT,btheosam/TizenRT,lokeshbv/TizenRT,sunghan-chang/TizenRT,btheosam/TizenRT,jeongarmy/TizenRT,jeongchanKim/TizenRT,Samsung/TizenRT,JeongJunSik/TizenRT,shivgarg/TizenRT,chanijjani/TizenRT,shivgarg/TizenRT,jsdosa/TizenRT,sunghan-chang/TizenRT,pillip8282/TizenRT,btheosam/TizenRT,junmin-kim/TizenRT,JeongJunSik/TizenRT,chanijjani/TizenRT,JeonginKim/TizenRT,heejin-kim/TizenRT,JeonginKim/TizenRT,jsdosa/TizenRT,chanijjani/TizenRT,HONGCHAEHEE/TizenRT