Misc p5 documentation updates

This MR includes multiple changes related to the p5 setup & operations:

• Update the DAQ infrastructure description
  • Add the complete fiber mapping
• Document the calibration pulse scan for the DOC (or other users)
• Document the operations required for a DAQ & online software update

requested review from @cgalloni

assigned to @lpetre

approved this merge request

merged

mentioned in commit 232a6720