add note about sendDefaultPii with user attributes

Author: AbhiPrasad

develop-docs/sdk/telemetry/logs.mdx

@@ -311,7 +311,7 @@ If a log is generated by an SDK integration, the SDK should also set the `sentry
 
 #### User Attributes
 
-If the log is associated with a user, the SDK should attach the following if available:
+If `sendDefaultPii`/`send_default_pii` is set to `true` in the SDK, the SDK should attach the following user data if available:
 
 1. `user.id`: The user ID. Maps to `id` in the [User](/sdk/data-model/event-payloads/user/) payload.
 2. `user.name`: The username. Maps to `username` in the [User](/sdk/data-model/event-payloads/user/) payload.