Update readme.python.md (Azure#24380)

Author: msyyc

specification/storagecache/resource-manager/readme.python.md

@@ -16,3 +16,8 @@ clear-output-folder: true
 no-namespace-folders: true
 output-folder: $(python-sdks-folder)/storage/azure-mgmt-storagecache/azure/mgmt/storagecache
 ```
+
+``` yaml $(python)
+modelerfour:
+  lenient-model-deduplication: true
+```