Add instructions to start threshold scan

Documenting the steps to run a threshold scan in P5

docs/operations/threshold-scan.md

@@ -8,7 +8,7 @@ From the RCMS interface, click on "Connect".
 
 Open the [xDAQ](http://srv-s2g18-33-01.cms:20100/urn:xdaq-application:service=calibration) calibration suite. In case the calibration suite page was already opened before you clicked on "Connect" in RCMS, reload the page manually.
 
-From the dropdown menu, select the calibration type "S-bit rate scan", then  set the number of iterations in the "Iterations" text box to 1 and leave all the other parameters to their default values. Click on "Apply settings".
+From the dropdown menu, select the calibration type "S-bit ARM DAC scan", then  set the number of iterations in the "Iterations" text box to 6 and leave all the other parameters to their default values. Click on "Apply settings".
 
 Go back to the RCMS interface, then follow these steps:
 1. click on "Configure" and wait for all the subsystems to be in _Configured_ state;
@@ -17,6 +17,6 @@ Go back to the RCMS interface, then follow these steps:
 
 Go back to the calibration suite in xDAQ, then click on "Run".
 
-While the scan is ongoing, from the P5 DAQ machine check that the output files are being written to the subfolders `fed1467` and `fed1468` of the folder `/gemdata/runs/test/sBitRateScan/`.
+While the scan is ongoing, from the P5 GEM DAQ machine check that the output files are being written to the subfolders `fed1467` and `fed1468` of the folder `/gemdata/runs/test/sBitRateScan/`.
 
 ## Analyzing the threshold scan results