change loadtesting catalog (#22592)

Author: kazrael2119

specification/loadtestservice/resource-manager/readme.typescript.md

@@ -7,7 +7,7 @@ Please also specify `--typescript-sdks-folder=<path to root folder of your azure
 typescript:
   azure-arm: true
   package-name: "@azure/arm-loadtesting"
-  output-folder: "$(typescript-sdks-folder)/sdk/loadtestservice/arm-loadtesting"
+  output-folder: "$(typescript-sdks-folder)/sdk/loadtesting/arm-loadtesting"
   payload-flattening-threshold: 1
   generate-metadata: true
 ```