update instructions for running NPD on windows

Author: mcshooter

README.md

@@ -227,7 +227,7 @@ make clean windows-binaries
 # Test in MINGW64 Window
 make test
 
-# Run with containerd log monitoring enabled in Powershell/Command Prompt. (Assumes containerd is installed.)
+# Run with containerd log monitoring enabled in Command Prompt. (Assumes containerd is installed.)
 %CD%\bin\windows_amd64\node-problem-detector.exe --logtostderr --enable-k8s-exporter=false --config.system-log-monitor=%CD%\config\windows-containerd-monitor-filelog.json
 ```