add 2020-10 to monitor python multiapi (#13089)

Author: 00Kai0

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

@@ -29,6 +29,7 @@ Generate all API versions currently shipped for this package
 ```yaml $(multiapi) && $(track2)
 clear-output-folder: true
 batch:
+  - tag: package-2020-10
   - tag: package-2020-05-preview
   - tag: package-2020-01-01-preview-only
   - tag: package-2019-11-01-preview-only
@@ -59,6 +60,16 @@ clear-output-folder: false
 perform-load: false
 ```
 
+### Tag: package-2020-10 and python
+
+These settings apply only when `--tag=package-2020-10 --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-2020-10'
+namespace: $(python-base-namespace).v2020_10_01
+output-folder: $(python-sdks-folder)/$(python-base-folder)/v2020_10_01
+```
+
 ### Tag: package-2020-05-preview and python
 
 These settings apply only when `--tag=package-2020-05-preview --python` is specified on the command line.