Update Windows command to support prettified json licenses (#40375)

docs/reference/licensing/update-license.asciidoc

@@ -92,7 +92,7 @@ On Windows machine, use the following command:
 
 [source,shell]
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-gc .\license.json |  Invoke-WebRequest -uri http://<host>:<port>/_license -Credential elastic -Method Put -ContentType "application/json"
+Invoke-WebRequest -uri http://<host>:<port>/_xpack/license -Credential elastic -Method Put -ContentType "application/json" -InFile .\license.json
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 In these examples,