user_guide: Add burn-in testing information

user_guide/docs/index.md

@@ -334,12 +334,13 @@ We encourage tinkering, however, we will not refund, repair, or replace any prod
 
 We have stress tested Castor & Pollux under the following conditions. These are provided for reference only; we do not guarentee that that the module will function under these conditions.
 
-* Overvoltage from power supply: ±18 volts
-* Reverse voltage from power supply: ±18 volts
-* Undervoltage from power supply: ±10 volts
-* Over and under voltage on inputs: ±8 volts
-* Output connected to another output: ±8 volts
-* Ouput shorted to ground: 60 minutes
+* Continuous run time: at least 48 hours
+* Overvoltage from power supply: at least ±18 volts
+* Reverse voltage from power supply: at least ±18 volts
+* Undervoltage from power supply: as low as ±10 volts
+* Over and under voltage on inputs: at least ±8 volts
+* Output connected to another output: at least ±8 volts
+* Output shorted to ground: at least 60 minutes
 
 
 ## Acknowledgments and thanks