Remove a line about setting "admin=yes" to reduce the amount of information

Because quick-start.md is getting longer with much information, it removes the note in favor of the linked registering-users.md documentation. The note is available on installing.md as well, and details about adding user accounts for other people can (and should) be checked on those documentations.

Also, this commit edits lines above these notes to make it clear that your user account will be an administrator of the server.

With this commit, the amount of the information about adding user accounts will be: registering-users.md > installing.md > quick-start.md

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/installing.md

@@ -77,7 +77,7 @@ As you have configured your brand new server and the client, you need to **creat
 
 After creating the user account, you can log in to it with [Element Web](configuring-playbook-client-element-web.md) that this playbook has installed for you at this URL: `https://element.example.com/`.
 
-To create your user account via this Ansible playbook, run the command below on your local computer.
+To create your user account (as an administrator of the server) via this Ansible playbook, run the command below on your local computer.
 
 **Notes**:
 - Make sure to adjust `YOUR_USERNAME_HERE` and `YOUR_PASSWORD_HERE`

docs/quick-start.md

@@ -129,12 +129,11 @@ Wait until the command completes. If it's all green, everything should be runnin
 
 As you have configured your brand new server and the client, you need to **create your user account** on your Matrix server.
 
-To create your user account via this Ansible playbook, run the command below on your local computer.
+To create your user account (as an administrator of the server) via this Ansible playbook, run the command below on your local computer.
 
 **Notes**:
 - Make sure to adjust `YOUR_USERNAME_HERE` and `YOUR_PASSWORD_HERE`
 - For `YOUR_USERNAME_HERE`, use a plain username like `john`, not your full identifier (`@user:example.com`)
-- Use `admin=yes` to make your user account an administrator of the Matrix server
 
 ```sh
 ansible-playbook -i inventory/hosts setup.yml --extra-vars='username=YOUR_USERNAME_HERE password=YOUR_PASSWORD_HERE admin=yes' --tags=register-user
@@ -142,6 +141,10 @@ ansible-playbook -i inventory/hosts setup.yml --extra-vars='username=YOUR_USERNA
 # Example: ansible-playbook -i inventory/hosts setup.yml --extra-vars='username=john password=secret-password admin=yes' --tags=register-user
 ```
 
+<!--
+NOTE: detailed instruction to add users can be found on docs/registering-users.md and installing.md, which include a note about usage of admin=yes and admin=no variables. In order to keep this guide as reasonably short as possible, let's not repeat the same instruction here.
+-->
+
 ## Finalize server installation
 
 <sup>This section is optimized for this quick-start guide and is derived from the following full-documentation page: [Server Delegation](howto-server-delegation.md)</sup>