Update known-issues.md (#1862)
Update known-issues.md (#1862)

Add the section on Win7 timeout issue.
EdwardBlair/cli,schellap/cli,mylibero/cli,MichaelSimons/cli,FubarDevelopment/cli,johnbeisner/cli,blackdwarf/cli,borgdylan/dotnet-cli,dasMulli/cli,weshaggard/cli,JohnChen0/cli,naamunds/cli,AbhitejJohn/cli,borgdylan/dotnet-cli,schellap/cli,MichaelSimons/cli,marono/cli,schellap/cli,JohnChen0/cli,Faizan2304/cli,danquirk/cli,marono/cli,danquirk/cli,danquirk/cli,mylibero/cli,borgdylan/dotnet-cli,mlorbetske/cli,harshjain2/cli,mylibero/cli,nguerrera/cli,svick/cli,blackdwarf/cli,livarcocc/cli-1,nguerrera/cli,danquirk/cli,JohnChen0/cli,AbhitejJohn/cli,weshaggard/cli,harshjain2/cli,marono/cli,weshaggard/cli,harshjain2/cli,schellap/cli,JohnChen0/cli,EdwardBlair/cli,svick/cli,MichaelSimons/cli,mlorbetske/cli,mylibero/cli,danquirk/cli,livarcocc/cli-1,dasMulli/cli,FubarDevelopment/cli,mylibero/cli,schellap/cli,marono/cli,borgdylan/dotnet-cli,livarcocc/cli-1,naamunds/cli,johnbeisner/cli,naamunds/cli,schellap/cli,FubarDevelopment/cli,blackdwarf/cli,AbhitejJohn/cli,nguerrera/cli,ravimeda/cli,Faizan2304/cli,MichaelSimons/cli,weshaggard/cli,johnbeisner/cli,borgdylan/dotnet-cli,MichaelSimons/cli,marono/cli,jonsequitur/cli,dasMulli/cli,naamunds/cli,ravimeda/cli,naamunds/cli,ravimeda/cli,svick/cli,jonsequitur/cli,weshaggard/cli,blackdwarf/cli,EdwardBlair/cli,jonsequitur/cli,mlorbetske/cli,nguerrera/cli,AbhitejJohn/cli,jonsequitur/cli,FubarDevelopment/cli,Faizan2304/cli,mlorbetske/cli