Update readme.python.md (#20108)

Author: BigCat20196

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

@@ -20,6 +20,7 @@ Generate all API versions currently shipped for this package
 multiapi: true
 clear-output-folder: true
 batch:
+  - tag: package-2021-11
   - tag: package-2021-06-preview
   - tag: package-2021-01-preview
   - tag: package-2018-01-preview
@@ -33,6 +34,16 @@ output-folder: $(python-sdks-folder)/servicebus/azure-mgmt-servicebus/azure/mgmt
 perform-load: false
 ```
 
+### Tag: package-2021-11 and python
+
+These settings apply only when `--tag=package-2021-11 --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-2021-11'
+namespace: azure.mgmt.servicebus.v2021_11_01
+output-folder: $(python-sdks-folder)/servicebus/azure-mgmt-servicebus/azure/mgmt/servicebus/v2021_11_01
+```
+
 ### Tag: package-2021-06-preview and python
 
 These settings apply only when `--tag=package-2021-06-preview --python` is specified on the command line.