Update commandline.md

Tweaked "Using GPUs" section to specify both gpu and gpu_int queues

docs/commandline.md

@@ -94,8 +94,10 @@ processing instructons [refer to our tutorial](tutorials/scaling-work.md).
 
 GPUs on the HBSGrid are currently accessible **by request only**. To request access, please use our [online form](https://forms.office.com/pages/responsepage.aspx?id=Tlb9CUK_IUOPLbjkgvhjXMoIB6PHisBIlawtyGb7ibhUNTJJOERNR1pNRzUzS0g4WkZKWjNHVjBTSy4u).
 
-To submit a GPU job, you must use the `gpu` queue. You must also explicitly
-specify gpu options; using a single dash for the default settings as shown in the
+To submit a GPU job, you must use the `gpu` queue (for batch jobs) 
+or the `gpu_int` queue (for interactive jobs). 
+You must also explicitly specify GPU options; using a single dash 
+for the default settings as shown in the
 example below is sufficient for many use cases.
 
 For example,