The PowerShell documentation team at Microsoft uses a similar extension for admonitions, closer to @Crissov 's suggestion:
> [!NOTE]
> Information the user should notice even if skimming.
> [!TIP]
> Optional information to help a user be more successful.
> [!IMPORTANT]
> Essential information required for user success.
> [!CAUTION]
> Negative potential consequences of an action.
> [!WARNING]
> Dangerous certain consequences of an action.
