make path and body positional (Azure#23185)

Author: iscai-msft

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

@@ -9,6 +9,7 @@ package-name: azure-mgmt-network
 no-namespace-folders: true
 package-version: 1.0.0b1
 combine-operation-files: true
+only-path-and-body-params-positional: true
 ```
 
 ### Python multi-api