Update job-scheduling.md

docs.it4i/cs/job-scheduling.md

@@ -254,6 +254,7 @@ $ scontrol -d show node p02-intel02 | grep ActiveFeatures
 
 Slurm supports the ability to define and schedule arbitrary resources - Generic RESources (GRES) in Slurm's terminology. We use GRES for scheduling/allocating GPGPUs and FPGAs.
 
+Get information about GRES on node:
 ```
 $ scontrol -d show node p03-amd01 | grep Gres=
    Gres=gpgpu:amd_mi100:4,fpga:xilinx_alveo_u250:2
@@ -261,6 +262,7 @@ $ scontrol -d show node p03-amd02 | grep Gres=
    Gres=gpgpu:amd_mi100:4,fpga:xilinx_alveo_u280:2
 ```
 
+Request specified GRES. GRES entry is using format "name[[:type]:count", in the following example name is fpga, type is xilinx_alveo_u280, and count is count 2.
 ```
 $ salloc -A PROJECT-ID -p p03-amd --gres=fpga:xilinx_alveo_u280:2
 salloc: Granted job allocation XXX