Clarify BatteryCommand with some documentation

Software/src/devboard/webserver/advanced_battery_html.cpp

@@ -5,6 +5,7 @@
 #include "../../datalayer/datalayer_extended.h"
 #include "../../include.h"
 
+// Available generic battery commands that are taken into use based on what the selected battery supports.
 std::vector<BatteryCommand> battery_commands = {
     {"clearIsolation", "Clear isolation fault", "clear any active isolation fault?",
      [](Battery* b) { return b && b->supports_clear_isolation(); },

Software/src/devboard/webserver/advanced_battery_html.h

@@ -15,6 +15,9 @@ String advanced_battery_processor(const String& var);
 
 class Battery;
 
+// Each BatteryCommand defines a command that can be performed by a battery.
+// Whether the selected battery supports the command is determined at run-time
+// by calling the condition callback.
 struct BatteryCommand {
   // The unique name of the route in the API to execute the command or a function in Javascript
   const char* identifier;