Add docs for usbtop

[samfreund]

Description

This PR adds documentation for using usbtop, a program for monitoring USB bus bandwidth. Many teams have been having issues with USB bus bandwidth, and including a tool with the PhotonVision image that allows them to monitor said bandwidth will likely prove beneficial.

This PR also documents lsusb, which can be used to get the max bandwidth on USB buses. This is helpful as it gives us a basline for debugging with usbtop.

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why, including events that led to this PR
• If this PR changes behavior or adds a feature, user documentation is updated
• If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
• If this PR touches configuration, this is backwards compatible with all settings going back to the previous seasons's last release (seasons end after champs ends)
• If this PR touches pipeline settings or anything related to data exchange, the frontend typing is updated
• If this PR addresses a bug, a regression test for it is added
• If this PR adds a dependency, the license has been checked for compatibility and steps taken to follow it

[mcm001]

Longer term I think we need to make more clear success/fail criteria to identify usb issues but this is enough for now