Update scheduler.md

Corrected dev queue info (to say budget must be positive).

docs/tursa-user-guide/scheduler.md

@@ -197,7 +197,7 @@ lists the active QoS on Tursa.
 | ---------- | ----------------- | ------------ | ----------- | ------------ | ------------ | ------|
 | standard   | 64                | 48 hrs       | 32          | 16           | gpu, cpu     | Only jobs sizes that are powers of 2 nodes are allowed (i.e. 1, 2, 4, 8, 16, 32, 64 nodes), only available when your budget is positive. |
 | low        | 64                | 24 hrs       | 4           | 4            | gpu, cpu     | Only jobs sizes that are powers of 2 nodes are allowed (i.e. 1, 2, 4, 8, 16, 32, 64 nodes), only available when your budget is zero or negative |
-| dev        | 2                | 4 hrs       | 2           | 1            | gpu, cpu     | For faster turnaround for development jobs and interactive sessions, only available when your budget is zero or negative. The dev QoS must be used with a GPU partition. |
+| dev        | 2                | 4 hrs       | 2           | 1            | gpu, cpu     | For faster turnaround for development jobs and interactive sessions, only available when your budget is positive. The dev QoS must be used with a GPU partition. |
 
 You can find out the QoS that you can use by running the following
 command: