Update readme.python.md (#25136)

Author: msyyc

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

@@ -18,9 +18,10 @@ Generate all API versions currently shipped for this package
 
 ```yaml $(python)
 multiapi: true
-default-api-version: "2023-02-01"
+default-api-version: "2023-04-01"
 clear-output-folder: true
 batch:
+  - tag: package-2023-04
   - tag: package-2023-02
   - tag: package-2021-02
   - tag: package-2021-02-preview-only
@@ -54,6 +55,16 @@ perform-load: false
 clear-output-folder: false
 ```
 
+### Tag: package-2023-04 and python
+
+These settings apply only when `--tag=package-2023-04 --python` is specified on the command line.
+Please also specify `--python-sdks-folder=<path to the root directory of your azure-sdk-for-python clone>`.
+
+``` yaml $(tag) == 'package-2023-04'
+namespace: azure.mgmt.network.v2023_04_01
+output-folder: $(python-sdks-folder)/network/azure-mgmt-network/azure/mgmt/network/v2023_04_01
+```
+
 ### Tag: package-2023-02 and python
 
 These settings apply only when `--tag=package-2023-02 --python` is specified on the command line.