Improve documentation on osswitch alias (#17)

home-manager/home.nix

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     # set some aliases, feel free to add more or remove some
     shellAliases = {
       osbuild = "nixos-rebuild build |& nom";
-      osswitch = "sudo echo Authenticating...; sudo nixos-rebuild switch |& nom";
+      osswitch = "echo \"Enter sudo password:\"; sudo echo \"Authenticated! Starting build.\"; sudo nixos-rebuild switch |& nom";
       gitprune = "git fetch -p ; git branch -r | awk '{print $1}' | egrep -v -f /dev/fd/0 <(git branch -vv | grep origin) | awk '{print $1}' | xargs git branch -D";
       gitsync = "git checkout main; git pull; gitprune;";
     };