added powershell GH_TOKEN environment variable instruction (#1904)

Author: permafrost06

docs/guide/recipes.md

@@ -72,7 +72,9 @@ On Linux/MacOS:
 
 On Windows:
 
-`set GH_TOKEN=TOKEN-GOES-HERE`
+CMD: `set GH_TOKEN=TOKEN-GOES-HERE`
+
+Powershell: `$env:GH_TOKEN = 'TOKEN-GOES-HERE'`
 
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