[Crash-utility] Patch to add comments

Hello Dave, A small cosmetic pach to add comments in the crash flow. Of course we may use !# to do this, but to call a shell just for a comment seems rather hard ? With !#, we have: crash> !# crash> !# sysrq-triger crash> !# crash> file_operations 0xffffffff81643300 struct file_operations { owner = 0x0, llseek = 0xffffffff81166b90 <noop_llseek>, read = 0, write = 0xffffffff812fa4b0 <write_sysrq_trigger>, [...] }After the introduction of the command #, we just have: crash> # crash> # sysrq-triger crash> # crash> file_operations 0xffffffff81643300 struct file_operations { owner = 0x0, llseek = 0xffffffff81166b90 <noop_llseek>, read = 0, write = 0xffffffff812fa4b0 <write_sysrq_trigger>, [...] }