[python][iothub] Update readme.python.md to convert to singleapi package (#35940)

* Initial plan

* Update IoT Hub readme.python.md to singleapi package format

Co-authored-by: msyyc <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>

Author: msyyc

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

@@ -2,74 +2,18 @@
 
 These settings apply only when `--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>`.
-Use `--python-mode=update` if you already have a setup.py and just want to update the code itself.
 
 ``` yaml $(python)
+title: IotHubClient
 azure-arm: true
 license-header: MICROSOFT_MIT_NO_VERSION
-namespace: azure.mgmt.iothub
 package-name: azure-mgmt-iothub
+namespace: azure.mgmt.iothub
 package-version: 1.0.0b1
 clear-output-folder: true
-no-namespace-folders: true
-```
-
-### Python multi-api
-
-Generate all API versions currently shipped for this package
-
-```yaml $(python)
-multiapi: true
-default-api-version: "2023-06-30"
-batch:
-  - tag: package-2023-06
-  - tag: package-preview-2023-06
-  - tag: package-preview-2019-07
-  - tag: package-2019-03
-  - multiapiscript: true
 ```
 
-``` yaml $(multiapiscript)
-output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub/
-perform-load: false
-```
-
-### Tag: package-2023-06 and python
-
-These settings apply only when `--tag=package-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-2023-06' && $(python)
-namespace: azure.mgmt.iothub.v2023_06_30
-output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub/v2023_06_30
-```
-
-### 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-2019-07 and python
-
-These settings apply only when `--tag=package-preview-2019-07 --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-2019-07' && $(python)
-namespace: azure.mgmt.iothub.v2019_07_01_preview
-output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub/v2019_07_01_preview
-```
-
-### Tag: package-2019-03 and python
-
-These settings apply only when `--tag=package-2019-03 --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-2019-03' && $(python)
-namespace: azure.mgmt.iothub.v2019_03_22
-output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub/v2019_03_22
+``` yaml $(python)
+no-namespace-folders: true
+output-folder: $(python-sdks-folder)/iothub/azure-mgmt-iothub/azure/mgmt/iothub
 ```