Specify description for all instruments

[xakep139]

See #4482 (comment) for details.

[joperezr]

Can I assign this one to you since I'm assuming you planned on working on this @xakep139 ?

[xakep139]

Not sure who will pick this up TBH. We're tracking all these telemetry issues anyway, so this one won't be missed.

[joperezr]

Okay, assigning this to you for now and feel free to assign it to someone else as appropriate

[joperezr]

This is not a dupe of #4522. That one is covering conceptual docs while this one is covering description in code.

This is a nice-to-have, but not required for November.

[joperezr]

We didn't have time to get to this one, so we are going to do it in 8.1