Only show the deprecated option section with help
if there are deprecated options
#16339
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This is somewhat of an annoyance I had for a while, most subsystems don't have deprecated options, so seeing this section with nothing feels pointless and adds space/noise to the output.
Before:
![Screen Shot 2022-07-28 at 12 32 59 PM](https://user-images.githubusercontent.com/1268088/181590696-d7c4273f-c857-4ff5-baf5-b507b6eff856.png)
After: