[docs] fix Doxygen error (#2253)
[docs] fix Doxygen error (#2253)


gandreello/openthread,aeliot/openthread,openthread/openthread,lanyuwen/openthread,fbsder/openthread,xiaom-GitHub/openthread,LeZhang2016/openthread,erja-gp/openthread,gandreello/openthread,bukepo/openthread,librasungirl/openthread,jwhui/openthread,abtink/openthread,srickardti/openthread,aeliot/openthread,georgecpr/openthread,pvanhorn/openthread,georgecpr/openthread,gandreello/openthread,aeliot/openthread,jwhui/openthread,turon/openthread,turon/openthread,georgecpr/openthread,aeliot/openthread,LeZhang2016/openthread,chshu/openthread,openthread/openthread,erja-gp/openthread,bukepo/openthread,chshu/openthread,fbsder/openthread,srickardti/openthread,erja-gp/openthread,erja-gp/openthread,chshu/openthread,erja-gp/openthread,pvanhorn/openthread,xiaom-GitHub/openthread,georgecpr/openthread,librasungirl/openthread,fbsder/openthread,abtink/openthread,mszczodrak/openthread,bukepo/openthread,pvanhorn/openthread,gandreello/openthread,lanyuwen/openthread,LeZhang2016/openthread,bukepo/openthread,srickardti/openthread,turon/openthread,xiaom-GitHub/openthread,mszczodrak/openthread,lanyuwen/openthread,pvanhorn/openthread,xiaom-GitHub/openthread,openthread/openthread,pvanhorn/openthread,fbsder/openthread,pvanhorn/openthread,lanyuwen/openthread,xiaom-GitHub/openthread,lanyuwen/openthread,fbsder/openthread,mszczodrak/openthread,lanyuwen/openthread,jwhui/openthread,erja-gp/openthread,abtink/openthread,librasungirl/openthread,aeliot/openthread,aeliot/openthread,chshu/openthread,jwhui/openthread,abtink/openthread,xiaom-GitHub/openthread,openthread/openthread,georgecpr/openthread,chshu/openthread,mszczodrak/openthread,fbsder/openthread,mszczodrak/openthread,turon/openthread,gandreello/openthread,librasungirl/openthread,srickardti/openthread,LeZhang2016/openthread,LeZhang2016/openthread,LeZhang2016/openthread,georgecpr/openthread,gandreello/openthread,chshu/openthread,mszczodrak/openthread