Update Ex_2.8_rightrot.rst
Update Ex_2.8_rightrot.rst

Sorry for my bad english,Hope you like it!
shabbir005/learntosolveit,gusyussh/learntosolveit,gusyussh/learntosolveit,shabbir005/learntosolveit,adeshmukh/learntosolveit,adsznzhang/learntosolveit,whcdanny/learntosolveit,adsznzhang/learntosolveit,beqa2323/learntosolveit,whcdanny/learntosolveit,adsznzhang/learntosolveit,shabbir005/learntosolveit,adsznzhang/learntosolveit,beqa2323/learntosolveit,shabbir005/learntosolveit,gusyussh/learntosolveit,beqa2323/learntosolveit,beqa2323/learntosolveit,adeshmukh/learntosolveit,whcdanny/learntosolveit,gusyussh/learntosolveit,whcdanny/learntosolveit,gusyussh/learntosolveit,adeshmukh/learntosolveit,shabbir005/learntosolveit,gusyussh/learntosolveit,shabbir005/learntosolveit,whcdanny/learntosolveit,gusyussh/learntosolveit,shabbir005/learntosolveit,beqa2323/learntosolveit,shabbir005/learntosolveit,gusyussh/learntosolveit,adeshmukh/learntosolveit,whcdanny/learntosolveit,adsznzhang/learntosolveit,adsznzhang/learntosolveit,adeshmukh/learntosolveit,beqa2323/learntosolveit,shabbir005/learntosolveit,gusyussh/learntosolveit,adeshmukh/learntosolveit