Clarify troubleshooting steps for flight desktop

[jkwmoore]

I thought that this would also include a flight verify step again too?

https://docs.hpc.shef.ac.uk/en/latest/hpc/flight-desktop.html#you-re-seeing-a-missing-prerequisites-error-message

Side note: "* Reprostory: EPEL" :| @Carldkennedy @nikishe I assume someone didn't copy paste this as the error on system is correctly spelled?