Fix typos and cleanup

src/scripts/dobuild.ps1

@@ -1,4 +1,4 @@
-# Unified build script for windows, linux and mac builder. Run on a windows machine inside powershell.
+# Unified build script for Windows, Linux and Mac builder. Run on a Windows machine inside powershell.
 param (
     [Parameter(Mandatory=$true)][string]$version,
     [Parameter(Mandatory=$true)][string]$prev,
@@ -49,4 +49,4 @@ if (! (Test-Path ./artifacts/linux-zec-qt-wallet-v$version.tar.gz) -or
         Write-Host "[Error]"
         exit 1;
     }
-Write-Host "[OK]"
+Write-Host "[OK]"