community-chat-platform: Formatting fix

The incorrect number of spaces in front of the * characters caused them
to be rendered as literal * characters instead of a sub-list

Signed-off-by: Bernhard Rosenkränzer <bernhard.rosenkraenzer.ext@huawei.com>

community-chat-platform.rst

@@ -27,8 +27,8 @@ by using the ``Register now`` link in GitLab.
 
 * Go to `<https://chat.ostc-eu.org>`
 * Login request will redirect you to `<https://git.ostc-eu.org>`
-  * Login using an existing account
-  * Create a new account following ``Register now`` link
+   * Login using an existing account
+   * Create a new account following ``Register now`` link
 * The system will redirect you back to `<https://chat.ostc-eu.org>`
 
 Chat Channels