Updated Module 20-22 with links.

Author: janetvong

README.md

@@ -117,9 +117,9 @@ Module | Topic | Video | Codelab | START here | FINISH here
 17|Migrate to Python 3 bundled services (Part 1)| [link](https://developers.googleblog.com/2022/10/extending-support-for-app-engine-bundled-services-module-17.html?utm_source=blog&utm_medium=partner&utm_campaign=CDR_wes_aap-serverless_mgrwormhole_sms_202002) | [link](http://codelabs.developers.google.com/codelabs/cloud-gae-python-migrate-17-bundled?utm_source=codelabs&utm_medium=et&utm_campaign=CDR_wes_aap-serverless_mgrwormhole_sms_202002&utm_content=-) | Module 1 [code](/mod1-flask) (2.x) | Module 1 [code](/mod1b-flask) (3.x)
 18|Add App Engine `taskqueue` pull tasks| [link](https://developers.googleblog.com/2022/11/how-to-use-app-engine-pull-tasks-module-18.html?utm_source=blog&utm_medium=partner&utm_campaign=CDR_wes_aap-serverless_mgrgaepull_sms_202013) | [link](https://codelabs.developers.google.com/codelabs/cloud-gae-python-migrate-18-gaepull?utm_source=codelabs&utm_medium=et&utm_campaign=CDR_wes_aap-serverless_mgrgaepull_sms_202013&utm_content=-) | Module 1 [code](/mod1-flask) (2.x) | Module 18 [code](/mod18-gaepull) (2.x)
 19|Migrate to Cloud Pub/Sub| [link](https://developers.googleblog.com/2022/12/migrating-from-app-engine-pull-tasks-to.html?utm_source=blog&utm_medium=partner&utm_campaign=CDR_wes_aap-serverless_mgrpubsub_sms_202016) | [link](https://codelabs.developers.google.com/codelabs/cloud-gae-python-migrate-19-pubsub?utm_source=codelabs&utm_medium=et&utm_campaign=CDR_wes_aap-serverless_mgrpubsub_sms_202016&utm_content=-) | Module 18 [code](/mod18-gaepull) (2.x) | Module 19 [code](/mod19-pubsub) (2.x & 3.x)
-20|Add App Engine `users` | _TBD_ | [link](https://codelabs.developers.google.com/codelabs/cloud-gae-python-migrate-20-gaeusers?utm_source=codelabs&utm_medium=et&utm_campaign=CDR_wes_aap-serverless_mgrgaeusers_sms_202119&utm_content=-)| Module 1 [code](/mod1-flask) (2.x) | Module 20 [code](/mod20-gaeusers) (2.x)
-21|Migrate to Cloud Identity Platform | _TBD_ | [link](https://codelabs.developers.google.com/codelabs/cloud-gae-python-migrate-21-idenplat?utm_source=codelabs&utm_medium=et&utm_campaign=CDR_wes_aap-serverless_mgridenplat_sms_202119&utm_content=-)| Module 20 [code](/mod20-gaeusers) (2.x) |  Module 21 [code](/mod21a-idenplat) (2.x) & [code](/mod21b-idenplat) (3.x)
-22|Migrate to Python 3 bundled services (Part 2)| _TBD_ | _N/A_ | Module 22  [code](/mod22-bundled) (2.x & 3.x) | _(⇐ same folder)_
+20|Add App Engine `users` | [link](https://goo.gle/3QlGCfG) | [link](https://codelabs.developers.google.com/codelabs/cloud-gae-python-migrate-20-gaeusers?utm_source=codelabs&utm_medium=et&utm_campaign=CDR_wes_aap-serverless_mgrgaeusers_sms_202119&utm_content=-)| Module 1 [code](/mod1-flask) (2.x) | Module 20 [code](/mod20-gaeusers) (2.x)
+21|Migrate to Cloud Identity Platform | [link](https://t.co/hlxcahRgGu) | [link](https://codelabs.developers.google.com/codelabs/cloud-gae-python-migrate-21-idenplat?utm_source=codelabs&utm_medium=et&utm_campaign=CDR_wes_aap-serverless_mgridenplat_sms_202119&utm_content=-)| Module 20 [code](/mod20-gaeusers) (2.x) |  Module 21 [code](/mod21a-idenplat) (2.x) & [code](/mod21b-idenplat) (3.x)
+22|Migrate to Python 3 bundled services (Part 2)| [link](http://youtu.be/ZhEBSvnz_BQ ) | _N/A_ | Module 22  [code](/mod22-bundled) (2.x & 3.x) | _(⇐ same folder)_
 
 
 ### Table of contents