Document --tags=list-matrix-registration-tokens

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/778

docs/configuring-playbook-matrix-registration.md

@@ -37,11 +37,14 @@ ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start
 
 It provides various [APIs](https://github.com/ZerataX/matrix-registration/wiki/api) - for creating registration tokens, listing tokens, disabling tokens, etc. To make use of all of its capabilities, consider using `curl`.
 
-We make the most common API (the one for creating unique registration tokens) easy to use via the playbook.
+We make the most common APIs easy to use via the playbook (see below).
 
-**To create a new user registration token (link)**, use this command:
 
-```
+### Creating registration tokens
+
+To **create a new user registration token (link)**, use this command:
+
+```bash
 ansible-playbook -i inventory/hosts setup.yml \
 --tags=generate-matrix-registration-token \
 --extra-vars="one_time=yes ex_date=2021-12-31"
@@ -51,3 +54,13 @@ The above command creates and returns a **one-time use** token, which **expires*
 Adjust the `one_time` and `ex_date` variables as you see fit.
 
 Share the unique registration link (generated by the command above) with users to let them register on your Matrix server.
+
+
+### Listing registration tokens
+
+To **list the existing user registration tokens**, use this command:
+
+```bash
+ansible-playbook -i inventory/hosts setup.yml \
+--tags=list-matrix-registration-tokens
+```