Updates executable name in beta setup scripts

Author: waldekmastykarz

scripts/setup-beta.ps1

@@ -83,4 +83,4 @@ Write-Host "Dev Proxy $version installed!"
 Write-Host
 Write-Host "To get started, run:"
 Write-Host "    . `$PROFILE.CurrentUserAllHosts"
-Write-Host "    devproxy --help"
+Write-Host "    devproxy-beta --help"

scripts/setup-beta.sh

@@ -94,4 +94,4 @@ echo "To get started, run:"
 if [[ "$fileUsed" != "" ]]; then
     echo "    source $fileUsed"
 fi
-echo "    devproxy -h"
+echo "    devproxy-beta -h"