Update to documentation of user configurable thermal management

configs/default.cfg

@@ -239,7 +239,7 @@ e_axis_active = True
 #[[ConstantName]]
 #type = constant-control
 #value = <number in range 0..255>
-#output = <name of output>
+#output = <optional output target name>
 #
 #[[SafetyName]]
 #type = safety
@@ -261,7 +261,7 @@ e_axis_active = True
 #on_value = <number in range 0..255>
 #off_value = <number in range 0..255>
 #sleep = <number, sec, time between control updates>
-#output = <output name>
+#output = <optional output target name>
 #
 #
 #[[ProportionalControlName]]
@@ -273,7 +273,7 @@ e_axis_active = True
 #min_value = <number in range 0..255>
 #ok_range = <number, output=min_value if input is within ok_range of target>
 #sleep = <number, sec, time between control updates>
-#output = <name of output>
+#output = <optional output target name>
 #
 #[[PIDControlName]]
 #type = pid-control
@@ -283,9 +283,10 @@ e_axis_active = True
 #pid_Ti = <number, integral constant>
 #pid_Td = <number, derivative constant>
 #ok_range = <number, output=0 if input is within ok_range of target>
-#on_off_range = <number, output max_value if input is less than target - on_off_range>
+#on_off_range = <optional number, output max_value if input is less than target - on_off_range>
 #max_value = <number in range 0..255>
 #sleep = <number, sec, time between control updates>
+#output = <optional output target name>
 #
 #[[CommandName]]
 #type = gcode