[tests] fix typo in Cert_9_2_12_Announce.py (#2072)
[tests] fix typo in Cert_9_2_12_Announce.py (#2072)


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