Format note block with bullet points for better readability

Co-authored-by: vishaangelova <[email protected]>

Author: Copilot

reference/fleet/elastic-agent-unprivileged.md

@@ -251,7 +251,11 @@ This functionality is in technical preview and may be changed or removed in a fu
 In certain cases you may want to install {{agent}} in `unprivileged` mode, with the agent running as a pre-existing user or as part of a pre-existing group. For example, on a Windows system you may have a service account in Active Directory and you’d like {{agent}} to run under that account.
 
 ::::{note}
-The `--password` parameter is only required on Windows. On Linux and macOS, the `--user` and `--group` parameters are optional. If you omit `--user`, {{agent}} uses (or creates) the default unprivileged user (`elastic-agent-user`). If you specify only `--group`, the agent runs unprivileged under its default user but with the requested group.
+The `--password` parameter is only required on Windows.
+
+On Linux and macOS, the `--user` and `--group` parameters are optional:
+* If you omit `--user`, {{agent}} uses (or creates) the default unprivileged user (`elastic-agent-user`).
+* If you specify only `--group`, the agent runs unprivileged under its default user but with the requested group.
 ::::
 
 To install {{agent}} in `unprivileged` mode as a specific user or group, use the following commands: