Use common strings: change "full identifier" to "full ID"

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

docs/installing.md

@@ -83,7 +83,7 @@ To create your user account (as an administrator of the server) via this Ansible
 
 **Notes**:
 - Make sure to adjust `YOUR_USERNAME_HERE` and `YOUR_PASSWORD_HERE`
-- For `YOUR_USERNAME_HERE`, use a plain username like `alice`, not your full identifier (`@alice:example.com`)
+- For `YOUR_USERNAME_HERE`, use a plain username like `alice`, not your full ID (`@alice:example.com`)
 - Use `admin=yes` to make your user account an administrator of the Matrix server
 
 ```sh

docs/quick-start.md

@@ -136,7 +136,7 @@ To create your user account (as an administrator of the server) via this Ansible
 
 **💡 Notes**:
 - Make sure to adjust `YOUR_USERNAME_HERE` and `YOUR_PASSWORD_HERE`
-- For `YOUR_USERNAME_HERE`, use a plain username like `alice`, not your full identifier (`@alice:example.com`)
+- For `YOUR_USERNAME_HERE`, use a plain username like `alice`, not your full ID (`@alice:example.com`)
 
 ```sh
 ansible-playbook -i inventory/hosts setup.yml --extra-vars='username=YOUR_USERNAME_HERE password=YOUR_PASSWORD_HERE admin=yes' --tags=register-user

docs/registering-users.md

@@ -15,7 +15,7 @@ Table of contents:
 
 **Notes**:
 - Make sure to adjust `USERNAME_HERE` and `PASSWORD_HERE`
-- For `USERNAME_HERE`, use a plain username like `alice`, not a full identifier (`@alice:example.com`)
+- For `USERNAME_HERE`, use a plain username like `alice`, not a full ID (`@alice:example.com`)
 - Use `admin=yes` or `admin=no` depending on whether you wish to make the user an administrator of the Matrix server
 
 After registering a user (using one of the methods below), **you can log in with that user** via the [Element Web](configuring-playbook-client-element-web.md) service that this playbook has installed for you at a URL like this: `https://element.example.com/`.

docs/updating-users-passwords.md

@@ -4,7 +4,7 @@
 
 **Notes**:
 - Make sure to adjust `USERNAME_HERE` and `PASSWORD_HERE`
-- For `USERNAME_HERE`, use a plain username like `alice`, not a full identifier (`@alice:example.com`)
+- For `USERNAME_HERE`, use a plain username like `alice`, not a full ID (`@alice:example.com`)
 
 You can reset a user's password via the Ansible playbook: