Update readme.python.md (#25320)

* Update readme.python.md

* Update readme.python.md

Author: ChenxiJiang333

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

@@ -22,6 +22,7 @@ Generate all API versions currently shipped for this package
 multiapi: true
 default-api-version: "2021-07-02"
 batch:
+  - tag: package-preview-2023-06
   - tag: package-preview-2022-11
   - tag: package-preview-2022-04-30
   - tag: package-2021-07-02
@@ -42,8 +43,19 @@ batch:
 
 ``` yaml $(multiapiscript)
 output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub/
+clear-output-folder: false
 perform-load: false
 ```
+### Tag: package-preview-2023-06 and python
+
+These settings apply only when `--tag=package-preview-2023-06 --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-preview-2023-06' && $(python)
+namespace: azure.mgmt.iothub.v2023_06_30_preview
+output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub/v2023_06_30_preview
+```
+
 ### Tag: package-preview-2022-11 and python
 
 These settings apply only when `--tag=package-preview-2022-11 --python` is specified on the command line.