Fix README to use hostfxr download links (#3622)
Fix README to use hostfxr download links (#3622)

Also fix a rebase error from b524fd079e6dcdd744faeb6061ccbfe99d1f810f#diff-04c6e90faac2675aa89e2176d2eec7d8
livarcocc/cli-1,weshaggard/cli,johnbeisner/cli,dasMulli/cli,naamunds/cli,naamunds/cli,jonsequitur/cli,AbhitejJohn/cli,harshjain2/cli,mlorbetske/cli,Faizan2304/cli,mlorbetske/cli,mlorbetske/cli,mlorbetske/cli,naamunds/cli,AbhitejJohn/cli,harshjain2/cli,Faizan2304/cli,ravimeda/cli,EdwardBlair/cli,naamunds/cli,dasMulli/cli,jonsequitur/cli,blackdwarf/cli,blackdwarf/cli,EdwardBlair/cli,nguerrera/cli,blackdwarf/cli,AbhitejJohn/cli,svick/cli,weshaggard/cli,johnbeisner/cli,nguerrera/cli,harshjain2/cli,jonsequitur/cli,johnbeisner/cli,livarcocc/cli-1,nguerrera/cli,weshaggard/cli,Faizan2304/cli,ravimeda/cli,AbhitejJohn/cli,livarcocc/cli-1,jonsequitur/cli,weshaggard/cli,svick/cli,weshaggard/cli,dasMulli/cli,naamunds/cli,blackdwarf/cli,svick/cli,nguerrera/cli,EdwardBlair/cli,ravimeda/cli