clarify challenge and hint text of stage_lines level
clarify challenge and hint text of stage_lines level

jaywon/githug,blueyi/githug,legendtkl/githug,hydrox24/githug,kuramameng/githug,HanJisoo/Test,eshimel/githug,raq929/githug,jackmaney/githug,youyou22/githug,mtam2/githug,stephencelis/githug,mtam2/githug,jackmaney/githug,resource11/githug,talexand/githug,zachalewel/githug,blueyi/githug,FP-QAs/githug,wrestt/githug,stephencelis/githug,FP-QAs/githug,eshimel/githug,resource11/githug,raq929/githug,ga-wdi-boston/githug,geoluther/githug,mtam2/githug,wrestt/githug,talexand/githug,geoluther/githug,jaywon/githug,ga-wdi-boston/githug,Gazler/githug,zachalewel/githug,youyou22/githug,blueyi/githug,jaywon/githug,kuramameng/githug,geoluther/githug,hydrox24/githug,jackmaney/githug,Limags/githug,FP-QAs/githug,Limags/githug,wrestt/githug,zachalewel/githug,eshimel/githug,resource11/githug,legendtkl/githug,Limags/githug,Gazler/githug,hydrox24/githug,legendtkl/githug,HanJisoo/Test,kaylal12/githug,HanJisoo/Test,talexand/githug,sideci-sample/sideci-sample-githug,raq929/githug,kaylal12/githug,youyou22/githug,sideci-sample/sideci-sample-githug,kuramameng/githug,FP-QAs/githug,Gazler/githug,kaylal12/githug