Target branch can't be second argument to merge
Target branch can't be second argument to merge

Remove instances in tutorial where the target branch for a merge is
supplied as a second argument to `git merge`.  The target branch for
merge is always the current branch.

iambocai/learnGitBranching,Hydex/learnGitBranching,myopensrc/learnGitBranching,jiyiren/learnGitBranching,william0503/learnGitBranching,ranjith068/learnGitBranching,kaaass/learnGitBranching,luthfi401/learnGitBranching,behind2/learnGitBranching,ZeroDragon/learnGitBranching,abecerramatias/GitBranching,lxbyes/learnGitBranching,andriymoroz/learnGitBranching,edombowsky/learnGitBranching,resource11/learnGitBranching,lichenbuliren/learnGitBranching,hugo-/learnGitBranching,myopensrc/learnGitBranching,lxbyes/learnGitBranching,bopo/learnGitBranching,jiyiren/learnGitBranching,gcbeyond/learnGitBranching,HoldenMills/learnGitBranching,Maximaximum/learnGitBranching,gdseller/learnGitBranching,luthfi401/learnGitBranching,alskjstl/learnGitBranching,gdseller/learnGitBranching,YihanWang2015/learnGitBranching,xumeng/learnGitBranching,lichenbuliren/learnGitBranching,resource11/learnGitBranching,codevlabs/learnGitBranching,Haemaru/learnGitBranching,Maximaximum/learnGitBranching,linglaiyao1314/learnGitBranching,pcottle/learnGitBranching,Hydex/learnGitBranching,andriymoroz/learnGitBranching,DD-L/learnGitBranching,kaaass/learnGitBranching,julie1013/learnGitBranching,alexeiberkov/learnGitBranching,thy09/learnGitBranching,abecerramatias/GitBranching,USIU-Hackathon/learnGitBranching,USIU-Hackathon/learnGitBranching,bopo/learnGitBranching,pcottle/learnGitBranching,edombowsky/learnGitBranching,kpchen/learnGitBranching,codevlabs/learnGitBranching,DD-L/learnGitBranching,yyn835314557/learnGitBranching,alskjstl/learnGitBranching,iambocai/learnGitBranching,hugo-/learnGitBranching,ranjith068/learnGitBranching,hoharu/learnGitBranching,HoldenMills/learnGitBranching,tzq668766/learnGitBranching,Haemaru/learnGitBranching,kpchen/learnGitBranching,william0503/learnGitBranching,YihanWang2015/learnGitBranching,xumeng/learnGitBranching,alexeiberkov/learnGitBranching,julie1013/learnGitBranching,yyn835314557/learnGitBranching,WilBeCoding/learnGitBranching,hoharu/learnGitBranching,gcbeyond/learnGitBranching,tzq668766/learnGitBranching,behind2/learnGitBranching,pcottle/learnGitBranching,linglaiyao1314/learnGitBranching,WilBeCoding/learnGitBranching,thy09/learnGitBranching